I have a Great Planes RealFlight Simulator TX, version G3, USB w/TX interface port, and a Real Flight Add-ons CD I'm selling as a package. $50 shipped in the USA. I do not have the original install disk, I had it installed on a hard drive that failed, and no longer have the CD for that. The G3 controller is compatible with:
RealFlight G3.x
RealFlight G5.x
RealFlight 6.x
RealFlight 7.x
RealFlight 8.x
RealFlight 9.x
RF-X
FMS
...maybe others, I don't know.
A version 9 download is online at:
https://www.realflight.com/dlrf9/index.php
I'm a little lost on installation with other software, but also have no further interest in doing so.
The add-ons are Volume 1, with 13 new aircraft, 7, new flying fields, and editable 3D terrain.