@Cyron43 I used the gameconfig that you gave me and I flew the same plane 2 times (meaning I flew the plane, landed it, exited it, entered it and flew it again) and it didn't crash. But when I spawned another add-on plane, it just crashed the whole game. Any other solution? Or maybe the cause of the crash is because I haven't got the latest update? (I have update 1.41)

@Cyron43 Will do! Then I'll tell you if it worked or not

What I'm trying to say is that if I open my game, spawn a modded plane, and enter it, it works fine. But If I exit the plane and re-enter it or enter another add-on plane, it just crashes. I also have add-on cars but they don't have this problem and they work perfecly. I am sure that I installed the plane correctly, reading carefully the instructions. Anyone can solve this problem? Thanks
P.S. If anyone wants to know my specs, they are the following:
8GB DD4 RAM
nVidia MX150 with 2GB VRAM
1TB HDD
Intel Core I5 8250u with 4 cores
Windows 10