Upgraded IMAC OS X version 10.8.5 to 10.12. X Plane now unable to barely run....for example you cannot change cockpit view to 3d....error message comes up saying X Plane encountered problem and closed. Here is the problem....tried to click on X Plane installer to reinstall...installer will not come up. In other words cannot due anything....add/delete scenery....update....etc. Can you please help. X-plane was running fine before I updated OSX 10.8 to OSX 10.12. My system is IMAC 2.9 GHZ Intel Core i5
Memory 32 GB 1600 Mhz DDR3
Graphics NVIDIA GeForce GTX 660M 512MB
Would appreciate any help