Thank you for replying.
After some testing, it seems like the Plugin is just not fit for Python3 anymore.
If I change the file to include import shutil that part works, but I get another error about something like “PosixPath and Strings cannot be concatenated”.
After fixing this by converting the PosixPath to a string, more and more errors pop up.
Thank very much you anyway.
PS:
Is there a way to edit my initial post to show [SOLVED]?
I cannot edit that post anymore 
PPS:
I can only mark 1 Post as SOLUTION, so I’d like to point out that
pointed me in the right direction.