If RF9.5 is like RF8, Help...About on your old PC will give you the serial number. It's also visible in RF8's launcher, and probably in 9.5's launcher too - assuming 9.5 has a launcher. Install it on the new PC & be sure to use the same email address & password to register it. If it's the Steam version, I don't know what will happen. I'm still running RF8. I haven't seen RF9, 9.5, 9.5S, or Evolution, so they may be different.