GWX claims my fresh install is modded.

[Karl_Tennstedt]

Originally Posted by Hebe Vollmaus

There is!
I mean, there is a "feauture to bypass this". To affirm the truth, there are actually more then one. The knowledge may needed is located everywhere on Subsim. Try searching. Try harder.

For example in the GWX-Thread here:
https://www.subsim.com/radioroom/sho...postcount=7307

This was the solution, wow this is embarassing. Im sorry guys :P