The better choice is RF 9.5 from Steam.
3.5 is over 16 years old. Time to pay the cost, and get the latest version.
Go to the RealFlight forums to find out if your existing controller is compatible enough (some of the eariler mostly work, but not with the newest features).
Also look into issues with Radeon video cards, although it sounds like Radeon has some drivers out to fix what they (Radeon) broke. But don't just assume it is what is listed as the "latest current".