tested? [Razz]
this should not work on any platform:
code:
If Not Exist ($Destination+kixforms.dll)
[Big Grin]

also:
code:
Copy "$Location" "C:\KIXFORMS\$CurrentVersion\"	
	If @Error=0
			Del $Location
			COPY $Source $Destination
			If @Error=0
				Shell $destination+'\regsvr32.exe $destination'+'\kixforms.dll /s'
			EndIf
		Else
			Shell $destination+'\regsvr32.exe $destination'+'\kixforms.dll /s'
		EndIf
copies the new dll to systemdir only if backing of old succesfull? sure you wanted it that way?

and then ofcourse, minor me want (and logic error):
code:
IF NOT INGROUP("\\@WKSTA\Administrators") <>0
	Return  ;user is not an admin so can't update KiXForms... return to calling script.
EndIf
could be:
code:
IF NOT INGROUP("\\@WKSTA\Administrators")
	Exit 5
EndIf
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