As part of my installer I have a custom action called CA.dll that unzips the contents of a file into the target directory. I've never had any problems with it but 1 person is getting an error message saying 'strong name validation failed for assembly " CA.dll"'. My understanding is that there is another assembly in the GAC named CA.dll. I've had a quick look and can see I can create a strong name for it but is there anything I can do in the meantime as a quick fix to get the current version working on this machine.