What exactly is your problem - we run the WWGM on all of our user's CAD machines without them having Admin permisssions?
Admin permissions are required to install the Application onto the CAD machine from the Windchill Server as this requires writing into the C:\Program Files directory (we do this for the users whenever there is an upgrade to the Windchill WWGM version). Once this is done the users can run the WWGM with their own priviledges and register the Catia version they are running without issue.
Rgds
Gary