Given that you suspect third-party software Gees, Pilot2ATC and SimToolKit Pro, the first thing to do is to contact each vendor and see what troubleshooting and advice they have.
If the sim doesn’t crash when they’re all turned off, then one or all of them are part of the problem.
Have you tried using only one at a time to see which of the three might actually be the suspect? That would narrow down contacting three different makers.