Just so you both know, I apparently have the older versions of add-ons 1+2 and I'm having exactly the same difficulties. Mine want's to install realflight version 1.1 and then add-on 1 and I have to delete the files the install creates (Only a couple files actually get built and stuck into the G3 directory tree) in order to get G3 to run again. I have been putting off figuring this out since G3 is still so new....glad I stumbled onto this thread.

USNRol