Installer - Available Actions

Category: Control

Run script

Runs a custom script. The script must return a boolean value. If it returns false, the installation will be canceled.

Applies to: Installation, Uninstallation

Properties:

Optional Rollback Script
The script that will be executed in case of a rollback. The return type is void.
Script
The script that will be executed. The script must return a boolean value. If it returns false, the installation will be canceled.

Set a variable

Sets a variable by running a custom script. The script must return a String.

Applies to: Installation, Uninstallation

Properties:

Fail if value is null
If selected, the action will fail if a null value is returned from the script.
Only if undefined
The variable will only be set if it was previously undefined. This is useful for variables that your user can pass via -V or -varfile at the command line.
Script
The script that will be executed. The script must return a String.
Variable name
The name of the variable that will be set. Enter the variable without the installer prefix and the percent signs.

Set messages

Sets the messages in the progress interface.

Applies to: Installation, Uninstallation

Properties:

Detail message
The detail message.
Status message
The status message.
Use detail
If the detail message should be set.
Use status
If the status message should be set.

Set the progress bar

Change the value of the progress bar or set it to indeterminate mode.

Applies to: Installation, Uninstallation

Properties:

Percent value
The progress value from 0 to 100. This property is only used when a percentage value is set or added.
Type of change
Change the progress bar either to a percentage value, add progress, set it to indeterminate mode, start a timer, or return from indeterminate mode and show the last percentage value.
Timer maximum value
The maximum progress value to be set by the timer. This property is only used when the timer is started.
Timer period
The time in milliseconds for one percent. This property is only used when the timer is started.

Sleep

Sleep a specified number of milliseconds. This is useful to ensure that a progess screen is displayed for at least a certain period of time.

Applies to: Installation, Uninstallation

Properties:

Sleep time
The sleep time in milliseconds.

Category: Desktop integration

Add a desktop link

Create a link on the desktop to an installed executable or file. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Create for all users
If the desktop link should be created for all users. If unselected, the link will be created for the current user only. If a "Create program group" screen is present, the "Create shortcuts for all users" check box will override this property.
Arguments
Optional arguments to the executable for Windows and Unix.
Tooltip description
An optional description for Windows that will be displayed in the tooltip.
Target file
The installed file or executable for which a link will be created on the desktop
Target is Single Bundle
If selected and the media set is a single bundle installer, the desktop icon will point to the bundle instead.
Name
The name of the desktop icon
Icon file
An optional different icon (*.ico) for the link on Windows.

Add an executable to the startup folder on Windows

Add an installed executable to the startup folder on Windows so that it will be started automatically when the user logs in. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Create for all users
If the startup item should be created for all users. If unselected, the link will be created for the current user only.
Startup executable
The executable that should be started when the user logs in
Entry name
The name of the entry in the startup folder

Create a file association

Create an association between a file extension and a launcher, so that the launcher is invoked when the user double-clicks a file with the selected extension. On Windows, if the application has not yet been started, the arguments to the main method will contain the file name. Subsequent invocations and all invocations on Mac OS X can be intercepted with the com.install4j.api.launcher.StartupNotification class. Only effective on Windows and Mac OS X. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Description
A description that is presented to the user as the text next to the corresponding checkbox in the "File associations" screen.
File extension
The file extension for which the file association should be created. Must not include the leading dot.
Launcher
The launcher that will be invoked when the file association is invoked by the user.
Execute on Mac OS X
If the file association should be performed on Mac OS X.
Icon file for Mac OS X
An optional icon file (*.icns) for the file association on Mac OS X. If empty, a default icon will be used.
Restart Finder
If true the Finder should be restarted at the end of the installation. This might be necessary for the icon (and sometimes the association itself) to be picked up immediately. Note that users might find this restart disruptive. Additionally, it you launch an application at the end of the installation it can be hidden by Finder windows.
Selected
If the file association is selected in the "File associations" screen.
Execute on Windows
If the file association should be performed on Windows.
Icon file for Windows
An optional icon file (*.ico) for the file association on Windows. If empty, a default icon will be used.

Create a quick launch icon

Create a link in the quick launch section of the Windows task bar to an installed executable or file. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Arguments
Optional arguments that should be passed to the executable when started with the quick launch link.
Description
The description that will be displayed in the tool tip
Target file
The installed file or executable for which a link will be created on the quick launch bar
Icon file
An optional icon file (*.ico) for the quick launch link. If empty, the default icon will be used.

Create program group

Create standard program group entries on Windows and freedesktop.org compatible UNIX desktops. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Add default launcher links
If generated launchers are placed into the program group automatically with their default menu untegration properties. You can rename and move the default menu integrations in the program group entries tree. If you delete them, the default menu integration can be enabled again on the "Executable info->Menu integration" step of the launcher wizard.
Add uninstaller
If the uninstaller should be added to the program group, too.
Create for all users
If the program group is created for all users or only for the current user. If a "Create program group" screen is present, the "Create shortcuts for all users" check box will override this property.
Application categories
The freedesktop.org (KDE, GNOME) application categories used to determine the best place in the applications menu. Multiple categories can be separated with a semicolon.
Enabled
If the program group creation should be performed by default. Note that if you set this property to false and the "Create program group" screen is not present, the program group will never be created.
Directory for links
The default value for the directory in which links for all relevant launchers (those with "menu integration" enabled) will be created on UNIX.
Program group entries

On Windows, the entries in the program group tree will be created in the start menu by the installer.

The control buttons allow you to modify the contents of the list of program group entries. You can add new sub-folders and new file links.In the edit dialog, you have to fill in the display name of the program group entry.as wellas the target file for the of the program group link. This has to be a file or directory relative to the distribution root directory. Please note that if you select a directory as the target, it will not "fly out" in the program group, but a separate explorer window will be opened if the user clicks on it. To display all files in a directory, please add all of them as separate program group entries.

Optionally, you can specify an icon that is used for this program group entry. The icon file must point to an *.ico file. If the file name is relative, it is interpreted as relative to the project file. If you do not specify an icon, the default icon is determined by the system.
Program group name
The default value for the program group where entries for all relevant launchers (those with "menu integration" enabled) will be created. If the "Create program group" screen is present, the user can change this selection. If you leave this property empty your links will be created at the top level.

Create start menu entry

Create a start menu entry on Windows. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Create for all users
If the program group is created for all users or only for the current user.
Arguments
Optional arguments that should be passed to the executable when started with this entry.
Entry name
The entry name in the start menu. The name can contain sub-folders with backslashes.
Target file
The installed file or executable for which a start menu entry will be created
Icon file
An optional icon file (*.ico) for the entry. If empty, the default icon will be used.

Register Add/Remove item

Register an Add/Remove item in the Windows software registry. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Icon
An optional icon file (*.ico).
Item name
The name of the item that is displayed in the Windows software registry.

Category: File operations

Add Windows file rights

Adds access rights to a file or directory on Windows.

Applies to: Installation, Uninstallation

Properties:

All
All available rights.
Execute
The right to execute the object.
File or Directory
The file or directory which rights should be modified. The rights for a directory will be inherited by all subdirectories and included files.
Group
The group for which the access right should be granted.
Read
The right to read the object.
Write
The right to write to the object.

Copy a file

Copy a file. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation, Uninstallation

Properties:

Delay if necessary
If selected and the destination file cannot be replaced, the operation will be scheduled for the next reboot. The variable sys.rebootRequired will be set to Boolean.TRUE in this case.
Destination file
The destination file.
Access mode
The UNIX access mode.
Overwrite mode
How to handle an existing destination file.
Shared file
If the file should be registered as a shared file.
Source file
The file to be copied.
Trigger reboot if required
If selected and the operation is delayed until reboot, the user will be asked for a reboot automatically at the end of installation.
Uninstall mode
The mode how the uninstaller should handle the file created with this action.

Create a symbolic link

Creates a symbolic link. This action has no effect on Windows.

Applies to: Installation, Uninstallation

Properties:

File
The file or directory that the symbolic link should point to.
Link file
The link file that should be created.
Remove on uninstall
If the link should be deleted by the 'Uninstall files' action in the uninstaller.

Delete a file or directory

Deletes a file or directory. The directory can be deleted recursively.

Applies to: Installation, Uninstallation

Properties:

Backup for rollback
If checked a backup of the files to be deleted will be made and restored in case of rollback.
File
The file to be deleted
Recurse into directories
If checked and the file is a directory the action will delete all content of this directory.

Install content of a zip file

Installs the content of an external zip file to an arbitrary location. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Delay if necessary
If selected and a destination file cannot be replaced, the operation will be scheduled for the next reboot. The variable sys.rebootRequired will be set to Boolean.TRUE in this case.
Destination directory
The destination directory. Relative directory information in the zip file will be added to this value
Dir access mode
The UNIX access mode of installed directories.
File access mode
The UNIX access mode of installed files.
Overwrite mode
How to handle an existing destination file.
Shared file
If the file should be registered as a shared file.
Show progress
If the action should show its progress with the progress bar and the detail message.
Trigger reboot if required
If selected and an operation is delayed until reboot, the user will be asked for a reboot automatically at the end of installation.
Uninstall mode
The mode how the uninstaller should handle files created with this action.
Zip file
The zip file that contains the content to be installed.

Move a file

Moves a file. The newly created file is subject to removal by the 'Uninstall files' action.

Applies to: Installation, Uninstallation

Properties:

Delay if necessary
If selected and the destination file cannot be replaced, the operation will be scheduled for the next reboot. The variable sys.rebootRequired will be set to Boolean.TRUE in this case.
Destination file
The destination file.
Access mode
The UNIX access mode.
Overwrite mode
How to handle an existing destination file.
Shared file
If the file should be registered as a shared file.
Source file
The file to be moved.
Trigger reboot if required
If selected and the operation is delayed until reboot, the user will be asked for a reboot automatically at the end of installation.
Uninstall mode
The mode how the uninstaller should handle the file created with this action.

Set the UNIX access mode of a file

Sets the UNIX access mode of a file. This action has no effect on Windows.

Applies to: Installation, Uninstallation

Properties:

File
The file or directory that the access mode should be set for.
Mode
The mode to be set. This can be any string that can be used with chmod.
Recursive
If true and file is a directory the operation will be performed recursively.

Set the modification time of a file

Sets the modification time of a file.

Applies to: Installation, Uninstallation

Properties:

File
The file or directory that the modification time should be set for.
Time
The new modification time.

Set the owner of a file

Sets the owner and optionally the group of a file. This action has no effect on Windows.

Applies to: Installation, Uninstallation

Properties:

File
The file or directory that the owner should be set for.
Owner
The owner to be set. If you want to set the group, too, please add it with a colon (example: user:group).
Recursive
If true and file is a directory the operation will be performed recursively.

Category: Final options

Create a response file

Create a response file at an arbitrary location to save user input for subsequent installations. This file can be used with the -varfile command line option.

Applies to: Installation, Uninstallation

Properties:

Excluded variables
The variable that should be excluded from the response file. If empty all variables will be used. The items in the list must be separated by semicolons. If you click on the edit button in the property editor, you can enter one item per line in a separate dialog. Entries that are installer variables with array values (e.g. String[] or Object[]) are expanded as separate entries, this allows you to build a variable length list of entries at runtime.
File
The file that the text should be appended to. If it doesn't exist it will be created.

Execute launcher

Execute an installed launcher and return immediately. This action is intended to be placed on the "Finish" screen. A confirmation can be added automatically to the "Finish" screen.

Applies to: Installation

Properties:

Launcher
The launcher that will be executed. Service launchers are not shown.

Reboot computer

Reboot the computer on Microsoft Windows. This action will trigger a reboot that takes place at the end of installation or uninstallation. By default, the user will be asked whether to reboot or not.

Applies to: Installation, Uninstallation

Properties:

Ask user
Ask the user whether the reboot should be performed or not.

Show URL

Show a URL in the default browser. This action is intended to be placed on the "Finish" or the "Uninstallation success" screen.

Applies to: Installation, Uninstallation

Properties:

URL
The URL that will be shown.

Show file

Show a file with the associated application. Usually, a text file or an HTML file is appropriate. This action is intended to be placed on the "Finish" screen. A confirmation can be added automatically to the "Finish" screen.

Applies to: Installation

Properties:

File
The file that will be shown.

Category: Miscellaneous

Add VM options

Adds VM options for a launcher by modifying or creating a *.vmoptions file or by changing the Info.plist file. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Launcher
The launcher that the VM options should be added for.
VM options
The unquoted options that should be added. The items in the list must be separated by semicolons. If you click on the edit button in the property editor, you can enter one item per line in a separate dialog. VM options that are installer variables with array values (e.g. String[] or Object[]) are expanded as separate VM options, this allows you to build a variable length list of VM options at runtime.

Modify an environment variable on Windows

Sets, appends to, or prepends to an environment variable on Windows.

Applies to: Installation, Uninstallation

Properties:

Modification type
Modification type
User specific
If the variable is user specific or system wide. This has no effect on Windows 9x.
Value
The value to be set, appended or prepended.
Variable name
The name of the variable that should be modified.

Modify classpath

Changes the classpath of a launcher by modifying or creating a *.vmoptions file or by changing the Info.plist file. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Classpath entries
The classpath entries. The items in the list must be separated by semicolons. If you click on the edit button in the property editor, you can enter one item per line in a separate dialog. Entries that are installer variables with array values (e.g. String[] or Object[]) are expanded as separate entries, this allows you to build a variable length list of entries at runtime.
Launcher
The launcher that the classpath should be changed for.
Modification type
Modification type

Require admin user

Requires that an admin user executes the installer otherwise fails. On Mac OS X, you can optionally restart the installer as the root user.

Applies to: Installation, Uninstallation

Properties:

Restart as root user
If selected and the user is an administrator, he will be asked for his password and the installer will be restarted with root privileges.

Run executable or batch file

Runs an executable or a Windows batch file. The action can optionally wait for termination of the executable.

Applies to: Installation, Uninstallation

Properties:

Arguments
The arguments passed to the executable. Please note that in the property sheet, arguments have to be separated by semicolons (;) and in the edit dialog each argument starts on a new line. The items in the list must be separated by semicolons. If you click on the edit button in the property editor, you can enter one item per line in a separate dialog. Arguments that are installer variables with array values (e.g. String[] or Object[]) are expanded as separate arguments, this allows you to build a variable length list of arguments at runtime.
Executable
The file that should be executed. Please do not add arguments here, there is a separate "Arguments" property.
Fail for redirection errors
If selected, the action fails if the redirection files cannot be accessed. Otherwise, those errors are silently ignored.
Log arguments
If the arguments should be written into the log file or not. Disabled by default due to security reasons.
Redirection file for stderr
A file to which the stderr output of the executed process is saved. If empty, the stderr output will be discarded.
Redirection file for stdin
A file which should be fed to the input stream of the executed process. If empty, the stdin input will be empty.
Redirection file for stdout
A file to which the stdout output of the executed process is saved. If empty, the stdout output will be discarded.
Wait for termination
If the action should wait for termination of the process and check if the return value is 0.
Working directory
The working directory for the execution.

Category: Registry modifications

Add access rights for a key in the Windows registry

Add access rights for a key in the Windows registry.

Applies to: Installation, Uninstallation

Properties:

All
All available rights.
Execute
The right to execute the object.
Group
The group for which the access right should be granted.
Key name
The name of the registry key without a leading backslash.
Read
The right to read the object.
Registry root
The Windows registry root where the key is located.
Write
The right to write to the object.

Delete a key or value in the Windows registry

Delete a key or value in the Windows registry.

Applies to: Installation, Uninstallation

Properties:

Key name
The name of the registry key that should be deleted or contains the value to be deleted without a leading backslash.
Only if empty
If a key should only be deleted when it contains no sub-keys or values.
Registry root
The Windows registry root where the key or value should be deleted.
Value name
The name of the registry value that should be deleted. If you leave this empty, the key will be deleted instead.

Delete a node or key in the Java preference store

Delete an entire package node or a key-value pair in the Java preference store.

Applies to: Installation, Uninstallation

Minimum Java requirement: 1.4

Properties:

Key
The key that should be deleted. If you leave this empty, the entire package node will be deleted instead. The action does not return an error if this key does not exist.
Only if empty
If a node should only be deleted when it contains no sub-nodes or keys.
Package name
The name of the package node in the preference store that should be deleted or contains the key-value pair to be deleted. The action does not return an error if this package node does not exist.
Preference root
If you want to delete the node or key-value pair for the current user, all users, or both.

Set a key in the Java preference store

Set a key-value pair in the Java preference store. The package node is created if necessary. This is the most convenient way to communicate settings to your launchers.

Applies to: Installation, Uninstallation

Minimum Java requirement: 1.4

Properties:

Key
The key for which a value should be set.
Package name
The name of the package node in the preference store where the key-value pair should be set.
Preference root
If you want to set the key for the current user only or for all users. Due to access rights it can happen that the system preference registry is not writable, in that case a fallback to the user specific registry can be tried.
Value
The string value that should be set for the key.

Set a value in the Windows registry

Set a value in the Windows registry. This action can also create the appropriate key if necessary.

Applies to: Installation, Uninstallation

Properties:

Create key
If set the key will be created if it doesn't exist.
Key name
The name of the registry key that contains the value or that should be created without a leading backslash.
Registry root
The Windows registry root where the key should be created
Value
The value that should be written into the registry.
Value name
The name of the registry value.

Category: Services

Install a service

Installs a service. On Windows, this is done by executing the service launcher with the appropriate arguments. On Unix, a link will be placed in /etc/init.d. On Mac OS, a StartupItem will be created. This action will be automatically reverted by the 'Uninstall files' action.

Applies to: Installation

Properties:

Add to "Services" screen
Ask the user in the "Services" screen whether this action should be performed or not.
Allow user to change start type
allow user to change the start type on the "Services screen"
Service
The service launcher that will be invoked.
Initially selected
Initially selected for installation on the "Services screen". Note that if this property is set to "false" and the "Services screen" is not present, this action will never be performed.

Start a service

Starts a service by executing the service launcher with the appropriate arguments.

Applies to: Installation

Properties:

Autostart only
If selected the service will only be started when it is installed as autostart service.
Service
The service launcher that will be started.

Stop a service

Stops a service by executing the service launcher with the appropriate arguments.

Applies to: Installation, Uninstallation

Properties:

Service
The service launcher that will be stopped.

Category: Text files

Append text to a file

Append text to a file or write text to a new file.

Applies to: Installation, Uninstallation

Properties:

Encoding
The encoding of the file. If you leave this empty the system default will be used.
Escaped text
If selected escape sequences like \n,\t or \u1234 in the text property will be replaced.
File
The file that the text should be appended to. If it doesn't exist it will be created.
Text
The text that should be appended.

Fix line feeds

Changes the line feeds of a text file to the platform specific type.

Applies to: Installation, Uninstallation

Properties:

File
The file or directory that the line feeds should be fixed for.
Recursive
If true and file is a directory the operation will be performed recursively. If false and file is a directory the files in this directory will be fixed, but no subdirectories will be entered.
Suffixes
The suffixes with a leading dot of the files to be fixed if the "File" property is a directory. If empty, all files will be used. The items in the list must be separated by semicolons. If you click on the edit button in the property editor, you can enter one item per line in a separate dialog. Suffixes that are installer variables with array values (e.g. String[] or Object[]) are expanded as separate suffixes, this allows you to build a variable length list of suffixes at runtime.

Modify a text file

Modify an installed text file by replacing a search value in the file.

Applies to: Installation, Uninstallation

Properties:

Encoding
The encoding of the file. If you leave this empty the system default will be used.
Escape for property file
If set, the replaced value will be escaped for use in a Java property file.
Text file
The text file that should be modified
Replace value
The value that should be used instead
Search value
The value that should be searched

Modify a text file with regular expressions

Modify an installed text file by applying a regular expression.

Applies to: Installation, Uninstallation

Minimum Java requirement: 1.4

Properties:

Encoding
The encoding of the file. If you leave this empty the system default will be used.
Escape for property file
If set, the replaced value will be escaped for use in a Java property file.
Text file
The text file that should be modified.
Quote variables
If values of installer variables in the match and replacement expressions should be quoted. This means that the characters of replaced installer variables will be treated literally instead of modifying the search or replace expressions with special charaters such as \ or $.
Match expression
The match expression.
Replace all
If all occurrences should be replaced or only the first one.
Replacement
The replacement.

Category: Update

Check for update

Load the update descriptor from the a URL and save it to the a variable. If sucessful, the variable will contain an instance of com.install4j.api.UpdateDescriptor

Applies to: Installation, Uninstallation

Properties:

Show error message
Show a default error message if the download fails.
Update descriptor URL
The URL from which the update descriptor for this project can be downloaded. The update descriptor file is automatically created when compiling the project and can be found in the media output directory. The URL must start with http://.
Variable
The installer variable to which an instance of class com.install4j.api.UpdateDescriptor will be saved if the action is sucessful.

Download file

Download a URL and save it to a file

Applies to: Installation, Uninstallation

Properties:

Delete downloaded file on exit
If selected, the downloaded file will be deleted when the installer application terminates.
Show error message
Show a default error message if the download fails.
Show file name
If selected, the name of the downloaded file and the target directory will be displayed. This setting has no effect if "Show progress" is not selected.
Show progress
If the action should show its progress with the progress bar.
Target file
The file to which the downloaded URL will be saved.
URL
The URL from which the file should be downloaded. The URL must start with http://.

Shut down calling launcher

Shut down the launcher that called this application if it was started with the com.install4j.api.launcher.ApplicationLauncher API.

Applies to: Installation, Uninstallation

Properties:

Timeout
The timeout in seconds this action will wait if the 'Wait' property is true. If set to 0 there will be no timeout.
Wait
If selected the action will wait for the calling launcher to exit.

Category: XML files

Apply an XSLT transform

Transform an installed file by applying an XSLT stylesheet.

Applies to: Installation, Uninstallation

Minimum Java requirement: 1.4

Properties:

Download external entities
If selected, a DTD referenced with an HTTP system ID will be downloaded as the document is parsed. The success of the action requires a direct internet connection in that case.
Destination file
The output of the transformation. This can be the same file as the source.
Source file
The source for the transformation. This can be the same file as the destination.
Validate XML file
If selected, the XML parser will validate the document according to a associated DTD or XML schema. If the validation is unsuccessful, the action will fail.
Stylesheet
The XSLT stylesheet to apply.

Replace text in XML files

Modify an installed XML file by selecting nodes with an XPath expression and applying a regular expression on the selected values.

Applies to: Installation, Uninstallation

Minimum Java requirement: 1.4

Properties:

Download external entities
If selected, a DTD referenced with an HTTP system ID will be downloaded as the document is parsed. The success of the action requires a direct internet connection in that case.
XML file
The XML file that should be modified.
Quote variables
If values of installer variables in the match and replacement expressions should be quoted. This means that the characters of replaced installer variables will be treated literally instead of modifying the search or replace expressions with special charaters such as \ or $.
Match expression
The match expression.
Replace all
If all occurrences should be replaced or only the first one.
Replacement
The replacement.
Validate XML file
If selected, the XML parser will validate the document according to a associated DTD or XML schema. If the validation is unsuccessful, the action will fail.
XPath expression
The XPath expression to selected DOM nodes that have a value (this includes attributes and text). Example for replacing text in an attribute: '/myRootNode/myChildNode/@myAttribute'. Example for replacing text in an element: '/myRootNode/myChildNode/text()'

Install files

Install all files in the distribution tree that are contained in the selected installation components.

Applies to: Installation

Properties:

Insufficient disk space warning
Show a warning message if there is not sufficent disk space for the installation on the selected target drive.
Delay if necessary
If selected and a destination file cannot be replaced, the operation will be scheduled for the next reboot. The variable sys.rebootRequired will be set to Boolean.TRUE in this case.
Directory resolver
Expression or script that resolves the actual installation directory separately for each installed file. Return null, if you would like to choose the standard installation directory for a file.
File filter
Expression or script that is invoked for each file to decide whether to install the file or not.
Show file names
If set, the names of the files that are installed will be shown during the installation.
Trigger reboot if required
If selected and an operation is delayed until reboot, the user will be asked for a reboot automatically at the end of installation.
Validate application id
Check if another application is installed in the selected directory or if the application is not the correct target for an add-on installer. If you have an "installation location" screen, you don't have to select this option.

Uninstall files

Uninstall all installed files.

Applies to: Uninstallation

Uninstall previous installation

Uninstalls the previous installation of this application in the selected installation directory.

Applies to: Installation