For the record it was FSR academy IFR that was my problem too. Good to see it has been patched now.
I have no idea why files cannot be removed from the community folder.
One thing to try is to shut down Windows Explorer in Task Manager (CTL ALT DEL), and then restart Windows Explorer. I keep a shortcut on my desktop that stops and restarts WE.
Also, you can often (not always) use a dos prompt to move files around that cannot be done in windows. You have to know a few common DOS commands like Change Directory (CD), Move, DIR (show all files in a folder), and so forth.
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DOS commands can be dangerous, you could erase every file off your computer if you are not familiar with DOS and careful.