Hey, you need to download the 64bit version. The DVD Version is only for 32bit. You just need to sign up on the Aerosoft Website and then you look under support files for the CRJ200. http://support.aerosoft.com/support.php?osCsid=ab548c452183b1144a35af92463f6edd You need to download version 1.53. You will get an installer for every OS. So you choose the mac installer. Put the CRJ200 in the aircraft folder. The next time you start X Plane 10/64bit with this aircraft, you just have to put in your serial number again. Keep the DVD version if you also want to fly in 32bit sometime. Have fun flying