RealFlight 6.5 is available now as a free online update for 6.0 owners! Obtain it through your RealFlight Launcher.

The boxed 6.5 upgrade that you're talking about for about $50 is a separate product available to RealFlight G3/G4/G5 owners that will allow them to upgrade to RealFlight 6.5 for a much lower cost. If you already have RF6, you do not need to buy that!

Note that if you have not kept up to date with the RF6 online updates, you will also get a lot of other new features and content that was released for free prior to 6.5.