NOTE, registered RealFlight 7 users don´t need to buy this upgrade - it´s a free download.If you already have RealFlight, you don´t have to purchase a complete edition of RF7.5 to enjoy the latest advances in the world´s #1 R/C flight simulator. All you need is this upgrade disk and the controller that came with your older version of compatible RealFlight software.After the upgrade, you´ll enjoy the same familiar, unchanged controller functions that you always have Â— plus all of RF7.5´s exciting new features!No other R/C simulator captures the experience of flying as completely and accurately as RealFlight, and RF7.5 raises the bar even higher! Among RF7.5´s innovations is a first for RealFlight: a wireless transmitter interface. RealPhysicsÂ™ technology has been further refined to recreate the nuances of multi-rotor aircraft Â— and speaking of quadcopters, there are several popular designs in RF7.5 that you can fly in any of the over 30 flying sites as well as in new Challenges. RF7.5 makes learning and honing R/C flying skills easy and fun, and because it´s so true to life, you´ll fly confidently and instinctively at the field!