Just hangs. The little fox logo in the top right jumps once, you select duplicates and the button to start working is greyed out. I've tried this several times in the last year or so, from complete re-installs and it doesn't work for me.
Where is your error report on GitHub? It's not okay to give bad reviews without contacting the developer to figure out what's going wrong. There are no other reports that it doesn't work.
