Hey, got the same message. When I go to install it in the steam morrowind folder, it tries to make a new folder by default, so the target location looks something like commons/morrowind/newfolder. I erased the /newfolder on the end of the target location and it installed without the error message. It still does not run properly but hopefully that helps someone in the future!
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cant seem to find the MGE "morrowinds installation directory (4 comments)