Will not work on my Mac in Orbx Central Support Forum Posted Wednesday at 09:17 PM Someone from Orbx will help you with the technical details but don’t give up. Both XP11 and Orbx Central do work on a 27 inch 5K iMac - assuming you have sufficient disk space available. I’m running it on a 2014 model, albeit with 16 GB of RAM. Both softwares downloaded and installed without issue for me, as did all the Orbx packages I’ve purchased so it is possible. You say it crashes XP11. But are you able to open up Orbx Central on its own? And if so have you downloaded any scenery yet?