Hi again Virtuali, I have also followed your instructions, uninstalled GSX and addon manager as suggested.
Disabled anti virus, Run the setup as admin, and I get exactly the same result, as per the screenshots, removing files not found etc, live update does not work, No GSX menu when pressing CTRL-F12, nothing at all.
Presently restoring a previously saved backup, taken before the update.
Your help with a solution is still requested.
Martin.