I am unable to run FS4 using my Mac. When I download the program from Steam the programme works exceptionally well. Then is stops working and I am then unable to start the programme. When I then delete the programme and reload it is possible to restart the programme, but after a short while it stops. I have checked with Apple and the Mac is working fine, with RAM and graphics card well in excess of what is needed to run FS4. Unfortunately Aerofly have not been helpful and have not even responded to requests of help, so very disappointed by this. Any ideas/help will be greatly appreciated!