It solved a problem for somebody else. I don’t know enough to conclude anything.
You could delete everything in documents/rack2 and reinstall rack2.0.3
But if you use ransomware protection, you would still get errors, if you didn’t add the Rack executable to the “allow” list.
Not sure the devs can solve all install errors - but it would be nice if a filename was giving on the “unlink” error, to narrow it down.