So basically if your GUI shows version 9.0.1500 is available on your XP DO NOT UPDATE through the GUI and only do a clean install or you’re asking for problems.

The same damn thing happened with V7 to V8 with the bogus update available errors. There were numerous users posting in multiple threads back then sending logs and begging for assistance and there was zero response from Avast. Obviously whatever was wrong then is getting repeated again now, but then of course this happening again because no one from Avast responded to this ongoing problem. Yes, I know a clean install is a work around and advisable, but if you don’t know not to update manually or if it is set to auto update, I guess you’re just screwed. On my machine I’ve seen this version update error 3 out of the last 4 times, a spectacular 75% rate of error.