Yes, it's terrible to answer your own post but here is what finally worked for me.
Turn off router to disable internet connection
Turn off all portions of AVG
Use realflight control panel to unistall completely]
Reboot computer
Install G2 leave controller unplugged, do not start RF
Install...
I apologize if this question has been answered a million times. I own a legit copy of G2 and addon #2. Yes, together they cost me $250 and I still want to use them. I have all the serial numbers but it will not load and run. It appears to load but when I try to play it asks for the upgrade CD...