Hi John, on the Tower web site here, the upgrade is only available for G4 and above. I'm not sure but it appears that it was a typo when he said G3 could be upgraded. If I remember right they completely overhauled the software between G3 and G4. For those same reasons the very old versions do not need t be un-registered if you want to give them to a friend.

http://www3.towerhobbies.com/cgi-bin...rade&search=Go