SimTools_GameManager.exe.config should be added to your SimTools installation directory automatically during patching.
If this is not the case, manually adding this file might help.
I therefore added the SimTools_GameManager.exe.config to the zip file again.
If you can patch the simulation but GameManager crashes after the start, please copy the file SimTools_GameManager.exe.config into the program directory of SimTools (typically: C:\Program Files (x86)\SimTools)