If you can go through this see if any of this works if not let us know. Experiencing Technical Issues Guide : Dovetail Support (freshdesk.com)
If it helps, I had this error. The game had been pre-downloaded, prior to launch. To fix, I ended up uninstalling, and then re-installing the core game and TSW 3 new DLC via the Xbox app on the PC.
If that is the case then naming of sections is MISLEADING on this forum... i was 100% sure that PC version is reserved only for STEAM version... XBOX =/= console !!!!! not anymore