Something like this should work. Untested because I do not have your setup but the steps short be more or less what you need.

 Code:
;Check group membership
If InGroup('PBX_User')
	;Check if UC client is installed
	If Not Exist($systemdrive + '\program files\Pascom\MobyDickClient\bin\md_mobydick.exe')
		? "Install UC-Client"
		;Installl UC client
		$Install = '\setup.exe /configure configuration-en-64.xml'
		Shell $install
	Else
		? "UC Client already installed"
		;Check UC client version
		$version = GetFileVersion($systemdrive + '\program files\Pascom\MobyDickClient\bin\md_mobydick.exe', "Productversion")
		If $version <> "1234567890"
			;Install current versiobn of UC client
			$Install = '\setup.exe /configure configuration-en-64.xml'
			Shell $install
		Else
			? "Current version of UC Client already installed"
		EndIf
	EndIf
	;start UC client
	Run $systemdrive + '\program files\Pascom\MobyDickClient\bin\md_mobydick.exe'
Else
	;UC client not needed for current user
	? "UC Client not available"
EndIf
_________________________
Mart

- Chuck Norris once sold ebay to ebay on ebay.