When I was trying to download just SFS KAssel - Wurzburg as part of TSW3, my TSW2 routes also got transferred. However, I wanted to leave them only in TSW2 and therefore only get the above 1 route that I only intended to download + other TSW3 only content. Is there anyway where I can download TSW3 without transferring my TSW2 progress and routes? I am interested to know.
What platform are you on? If you're on steam, there's a dlc tab and you just uncheck the dlc you don't want and steam will do its thing. I think it's also similar with epic but I don't use it so have a look around In the profile tab, you can create a new profile and delete your current one if you want to start over from scratch