If you ever want to fix an issue like this in the future, it's very easy to just create an empty folder on c:\ named something like "empty" and use robocopy to

If you ever want to fix an issue like this in the future, it's very easy to just create an empty folder on c:\ named something like "empty" and use robocopy to mirror the empty folder into the folder that is too deep. robocopy c:\empty c:\so_many_subdirectories /mir will do the trick.