Used the Scripts for Adobe Flash installation by Der-Matze as the starting point.

Improved it so that just one script is necessary and a product property is used to decide if it should be installed for IE or other browsers.

Tested with opsi 4.0.1
Tested with opsi-winst 4.11.1.6
Tested with Windows 7 Professional 32 and 64 Bit

Installation Script for Adobe Flash ActiveX 11.0.2.202.233 with custom settings file
Uninstallation Script for Adobe Flash ActiveX Versions 10.0.45.2 - 11.0.2.202.233

The installation files can be downloaded from: http://www.adobe.com/special/products/flashplayer/fp_distribution3.html (You may need to apply for a distribution license!)

Note: settings.sol can be found in “%UserProfileDir%\Anwendungsdaten\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\” and customized via Control Panel\Flash Player. You might have to run the configuration in the Control Panel before the file is created.

[Initial]
;Standard Text, der während der Installation angezeigt wird
Message = Bitte warten, das Produkt wird installiert
;Loglevel einstellen
setLogLevel = 6
;Bei Fehlern abbrechen
ExitOnError = false
;Syntax Fehler werden in einem separaten Fenster angezeigt
ScriptErrorMessages = on
;Single-Step Mode nicht verwenden
TraceMode = off
;Im Batchmode das Winst-Fenster nicht im Vordergrund anzeigen
StayOnTop = false
 
[Actions]
;Variable für die Ermittlung des Betriebssystems
DefVar $OS$
set $OS$ = GetOS
 
;Variable für die Ermittlung der Betriebssystem Unterversion
DefVar $NTVersion$
set $NTVersion$ = GetNTVersion
 
;Variable zur Ermittlung der Systemarchitektur
DefVar $SystemType$
Set $SystemType$ = GetSystemType
 
;Name des Produkts (max. 12 Zeichen)
DefVar $ProductName$
Set $ProductName$ = "Adobe Flash"
 
;Vollständiger Produktname incl. Versionsnummer
 
DefVar $ProductNameFull1$
set $ProductNameFull1$ = "Adobe Flash 11.0.2.202.233 Plugin"
 
;Dateiname des Produktbildes mit Erweiterung
DefVar $ProductPicture$
Set $ProductPicture$ = "Adobe Flash.png"
 
;Selektiert, ob das Plugin fuer IE oder andere Browser installiert werden soll
DefVar $BrowserType$
DefVar $Executable1$
DefVar $Executable2$
Set $BrowserType$ = GetProductProperty("browsertype","IE")
;Dateinamen der zu installierenden MSI-Pakete
if ($BrowserType$ = "IE")
	Set $Executable1$ = "install_flash_player_11_active_x_32bit.msi"
	Set $Executable2$ = "install_flash_player_11_active_x_64bit.msi"
else
	Set $Executable1$ = "install_flash_player_11_plugin_32bit.msi"
	Set $Executable2$ = "install_flash_player_11_plugin_64bit.msi"
endif
 
;Die Variable zur Auswertung des ExitCodes
DefVar $ExitCode$
 
;Prüfen der Winst Version
requiredWinstVersion >= "4.11"
 
;$ProductPicture$ und $ProductName$ anzeigen
ShowBitmap /3 "%scriptpath%\" + $ProductPicture$ $ProductName$
 
;Anzeigen der Installationsbenachrichtigung incl. des vollen Produktnamens
Message "Installiere "+$ProductNameFull1$
 
;Freien Speicherplatz ermitteln
if not (HasMinimumSpace ("%SYSTEMDRIVE%", "500 MB"))
     LogError "Nicht genügend Platz auf %SYSTEMDRIVE%"
     isFatalError
endif
 
;OS-Version ermitteln
if ( $NTVersion$ = "Win2K" OR $NTVersion$ = "WinXP" OR $NTVersion$ = "Win NT 5.2" OR $NTVersion$ = "Windows Vista" )
    if $SystemType$ = "x86 System"
	Winbatch_Install_32-Bit
	sub "%ScriptDrive%\install\check_exitcode\check_msi-exitcode.ins"
    endif
    if $SystemType$ = "64 Bit System"
	Winbatch_Install_64-Bit
	sub "%ScriptDrive%\install\check_exitcode\check_msi-exitcode.ins"
    endif
    if ( $NTVersion$ = "Win2K" OR $NTVersion$ = "WinXP" OR $NTVersion$ = "Win NT 5.2" )
	Files_Copy_AllUsers_WinNT5x /AllNTUserProfiles
    endif
    if ( $NTVersion$ = "Windows Vista" )
	Files_Copy_AllUsers_WinNT6x /AllNTUserProfiles
    endif
else
        LogError "Kein kompatibles Betriebssystem installiert"
	isFatalError
endif
 
[Winbatch_Install_32-Bit]
msiexec /i "%SCRIPTPATH%\$Executable1$" /qb-! reboot=reallysuppress
 
[Winbatch_Install_64-Bit]
msiexec /i "%SCRIPTPATH%\$Executable2$" /qb-! reboot=reallysuppress
 
[Files_Copy_AllUsers_WinNT5x]
;Konfigurationsdatei in alle Userprofile kopieren
copy -s "%SCRIPTPATH%\settings.sol" "%UserProfileDir%\Anwendungsdaten\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\"
 
[Files_Copy_AllUsers_WinNT6x]
;Konfigurationsdatei in alle Userprofile kopieren
copy -s "%SCRIPTPATH%\settings.sol" "%UserProfileDir%\AppData\Roaming\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\"

[Initial]
;Standard Text, shown during installation
Message = Bitte warten, das Produkt wird Deinstalliert
 
;Set Loglevel
setLogLevel = 6
 
;Stop when errors
ExitOnError = false
 
;Syntax Fehler are shown in a seperate window
ScriptErrorMessages = on
 
;Do not use Single-Step Mode
TraceMode = off
 
;No winst-window in foreground while batchmode
StayOnTop = false
 
[Actions]
;Variable for the OS
DefVar $OS$
Set $OS$ = GetOS
 
;Variable for the OS-subversion
DefVar $NTVersion$
Set $NTVersion$ = GetNTVersion
 
;Name of product (max. 12 columns)
DefVar $ProductName$
Set $ProductName$ = "Adobe Flash"
 
;filename of productpicture with extension
DefVar $ProductPicture$
Set $ProductPicture$ = "Adobe Flash.png"
 
;the variable for the ExitCode
DefVar $ExitCode$
 
;show $ProductPicture$ and $ProductName$
ShowBitmap /3 "%scriptpath%\" + $ProductPicture$ $ProductName$
 
sub "%ScriptPath%\SubUninstall.ins"

;Variable für den msiexec Aufruf zur Deinstallation
DefVar $UninstallCommand$
 
;Variable für die jeweilige Version. Wird aus der Registry ausgelesen
DefVar $DisplayName$
 
;Adobe Flash ActiveX 11.0.2.202 64-Bit deinstallieren, wenn es in der Registry gefunden wurde
Set $DisplayName$ = GetRegistrystringvalue64("[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{9E25236A-E313-4853-9C8C-DB7015E9F9C4}] DisplayName")
if not ($DisplayName$ = "")
    set $UninstallCommand$ = "MsiExec.exe /x {9E25236A-E313-4853-9C8C-DB7015E9F9C4} /qb-! REBOOT=ReallySuppress"
endif
 
;Adobe Flash Plugin 11.0.2.202 64-Bit deinstallieren, wenn es in der Registry gefunden wurde
Set $DisplayName$ = GetRegistrystringvalue64("[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{1E4B6678-A507-4B6A-B6C7-FEE55FC0C14C}] DisplayName")
if not ($DisplayName$ = "")
    set $UninstallCommand$ = "MsiExec.exe /x {1E4B6678-A507-4B6A-B6C7-FEE55FC0C14C} /qb-! REBOOT=ReallySuppress"
endif
 
;Adobe Flash Plugin 11.0.2.202 32-Bit deinstallieren, wenn es in der Registry gefunden wurde
Set $DisplayName$ = GetRegistrystringvalue64("[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{B2883418-71EB-4F63-97AB-222C67E99358}] DisplayName")
if not ($DisplayName$ = "")
    set $UninstallCommand$ = "MsiExec.exe /x {B2883418-71EB-4F63-97AB-222C67E99358} /qb-! REBOOT=ReallySuppress"
endif
 
;Adobe Flash Active X 11.0.2.202 32-Bit deinstallieren, wenn es in der Registry gefunden wurde
Set $DisplayName$ = GetRegistrystringvalue64("[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{6B393C32-A8CE-4663-9D5B-EA75C8D1233C}] DisplayName")
if not ($DisplayName$ = "")
    set $UninstallCommand$ = "MsiExec.exe /x {6B393C32-A8CE-4663-9D5B-EA75C8D1233C} /qb-! REBOOT=ReallySuppress"
endif
 
Message "Deinstalliere "+$DisplayName$
Winbatch_Uninstall
sub "%ScriptDrive%\install\check_exitcode\check_msi-exitcode.ins"
 
if ( $NTVersion$ = "Win2K" OR $NTVersion$ = "WinXP" OR $NTVersion$ = "Win NT 5.2" )
    Files_Delete_AllUsers_WinNT5x /AllNTUserProfiles
endif
 
if ( $NTVersion$ = "Windows Vista" )
    Files_Delete_AllUsers_WinNT6x /AllNTUserProfiles
endif
 
[Winbatch_Uninstall]
$UninstallCommand$
 
[Files_Delete_AllUsers_WinNT5x]
;Konfigurationsordner in allen Userprofilen löschen
delete -sf "%UserProfileDir%\Anwendungsdaten\Macromedia\"
 
[Files_Delete_AllUsers_WinNT6x]
;Konfigurationsordner in allen Userprofilen löschen
delete -sf "%UserProfileDir%\AppData\Roaming\Macromedia\"