Sadly I have the same issue! in the morning I was flying in the sim but in the same evening, I was not able to lunch the sim anymore! I didn’t install or remove anything on my PC(Maybe an automatic windows update?!)
So far I have tried the following:
1-Removing all the community addons
2-Removing the rolling catch
3-Removing the app data (Letting it regenerate again)
4-Checking windows for corrupted files (following forum instructions)
5-Removing all USB and wireless connection
6-Lunching the Sim offline
None of the above worked for me.
Best Regards,