Sorry to write in English.
I had exactly the same problem with TS 2020!
The only difference was the fatal message: Access violation.
There is somewhere some conflict between files.
The solution was to delete TS2020 and remake a "clean" installation excluding all bought items except the DLC from Steam, and all the workshop items.
Now it works, but I should reintroduce one-by-one my old DLC's, checking for each if it gives trouble.
Renato Gaudio Torino Italien