You need the Installer for Gpg4win 2.2.1.
And You can download it here: http://www.heise.de/download/gpg4win-1119466.html

1. Download the Installer for Gpg4win 2.2.1
   and put it to the CLIENT_DATA-directory on your Workbench.
   
2. Create a new file named gpg4win.ini and fill it up with the script provided down there
   if you want to install Gpg4win with your own Specials.
   and put this file in the CLIENT-DATA-Directory too.
3. Create new textfiles in the CLIENT_DATA-directory and fill them up with the scripts provided down there.
   You might want to edit some lines in order to fit your needs.
   
4. Ready the package and install it on your server.

[Actions]
[Initial]
SetLogLevel=9
;  Log Errors in Logfile but don't abort:
ExitOnError=false
; Show syntax errors in the script:
ScriptErrorMessages=on
; Dont trace step by step through the script:
TraceMode=off
; let started programs run in front of the winst window
StayOnTop=false
 
 
[Actions]
requiredWinstVersion >= "4.10.8.6"
 
DefVar $LogDir$
DefVar $ProductId$
DefVar $MinimumSpace$
DefVar $InstallDir32$
DefVar $InstallDir64$
DefVar $InstallDir32_Cmd$
DefVar $InstallDir64_Cmd$
DefVar $ExitCode$
DefVar $LicenseRequired$
DefVar $LicenseKey$
DefVar $LicensePool$
DefVar $INST_SystemType$
DefVar $INST_architecture$
DefVar $Version$
DefVar $Inst_Cmd$
DefVar $Inst_Prg32$
DefVar $Inst_Prg64$
DefVar $Uninst_Cmd$
DefVar $Uninst_Prg$
 
Set $INST_SystemType$ = GetSystemType
set $INST_architecture$ = GetProductProperty("install_architecture","system specific")
 
 
Set $LogDir$ = "%SystemDrive%\tmp"
 
; ----------------------------------------------------------------
; - Please edit the following values                             -
; ----------------------------------------------------------------
;$ProductId$ should be the name of the product in opsi
; therefore please: only lower letters, no umlauts,
; no white space use '-' as a seperator
Set $ProductId$       = "Gpg4win"
Set $Version$         = "2.2.1"
Set $MinimumSpace$    = "50 MB"
; the path were we find the product after the installation
Set $InstallDir32$      = "%ProgramFiles32Dir%\Gpg4win\"
Set $InstallDir64$      = "%ProgramFiles64Dir%\Gpg4win\"
Set $InstallDir32_Cmd$      = "/D=%ProgramFiles32Dir%\Gpg4win\"
Set $InstallDir64_Cmd$      = "/D=%ProgramFiles64Dir%\Gpg4win\"
Set $LicenseRequired$ = "false"
Set $LicensePool$     = "p_" + $ProductId$
Set $Inst_Prg32$      = "gpg4win-2.2.1.exe"
Set $Inst_Prg64$      = "gpg4win-2.2.1.exe"
Set $Uninst_Prg$      = "gpg4win-uninstall.exe"
Set $Inst_Cmd$        = '/S /C=%ScriptPath%\gpg4win.ini'
Set $Uninst_Cmd$      = '/S'
; ----------------------------------------------------------------
 
comment "Show product picture"
ShowBitmap "%ScriptPath%\" + $ProductId$ + ".jpg" $ProductId$
 
if not(HasMinimumSpace ("%SystemDrive%", $MinimumSpace$))
        LogError "Not enough space on %SystemDrive%, " + $MinimumSpace$ + " on drive %SystemDrive% needed for " + $ProductId$
        isFatalError
        ; Stop process and set installation status to failed
else
 
        if FileExists($InstallDir32$+$Uninst_Prg$)
;        if FileExists("%ProgramFiles32Dir%\Gpg4win\gpg4win-uninstall.exe")
                comment "Start uninstall sub section"
                Sub "%ScriptPath%\delsub.ins"
        endif
        if FileExists($InstallDir64$+$Uninst_Prg$)
;        if FileExists("%ProgramFiles64Dir%\Gpg4win\gpg4win-uninstall.exe")
                comment "Start uninstall sub section"
                Sub "%ScriptPath%\delsub.ins"
        endif
 
        if $LicenseRequired$ = "true"
                comment "Licensing required, reserve license and get license key"
                Sub_get_licensekey
        endif
 
        comment "Installiere "+$ProductID$+"..."
 
        if (($INST_SystemType$ = "x86 System") and ($INST_architecture$ = "system specific")) or ($INST_architecture$ = "both") or ($INST_architecture$ = "32 only")
                Message "Installiere " + $ProductId$+" (32 Bit)"
                comment "Start setup program"
                Winbatch_install_32
                Sub_check_exitcode
        endif
 
        if ($INST_SystemType$ = "64 Bit System") and (($INST_architecture$ = "system specific") or ($INST_architecture$ = "both") or ($INST_architecture$ = "64 only"))
                Message "Installiere " + $ProductId$+" (64 Bit)"
                comment "Start setup program"
                Winbatch_install_64
                Sub_check_exitcode
        endif
 
endif
 
 
[Winbatch_install_32]
net stop dirmngr
%ScriptPath%\$Inst_Prg32$ $Inst_Cmd$ $InstallDir32_Cmd$
 
[Winbatch_install_64]
net stop dirmngr
%ScriptPath%\$Inst_Prg64$ $Inst_Cmd$ $InstallDir64_Cmd$
 
[Sub_check_exitcode]
comment "Test for installation success via exit code"
set $ExitCode$ = getLastExitCode
if ($ExitCode$ = "0")
        comment "Looks good: setup program gives exitcode zero"
else
        comment "Setup program gives a exitcode unequal zero: " + $ExitCode$
        if ($ExitCode$ = "1605")
                comment "ERROR_UNKNOWN_PRODUCT  1605    This action is only valid for products that are currently installed."
                comment "Uninstall of a not installed product failed - no problem"
        else
                if ($ExitCode$ = "1641")
                        comment "looks good: setup program gives exitcode 1641"
                        comment "ERROR_SUCCESS_REBOOT_INITIATED 1641    The installer has initiated a restart. This message is indicative of a success."
                else
                        if ($ExitCode$ = "3010")
                                comment "looks good: setup program gives exitcode 3010"
                                comment "ERROR_SUCCESS_REBOOT_REQUIRED  3010    A restart is required to complete the install. This message is indicative of a success."
                        else
                                logError "Fatal: Setup program gives an unknown exitcode unequal zero: " + $ExitCode$
                                isFatalError
                        endif
                endif
        endif
endif

[Actions]

[Actions]