Instead of hunting for a fake “310 40 activation key,” spend that energy curating your media library. Remove duplicates manually once using a free tool, then set up automatic organization rules. Your future self—and your hard drive—will thank you.
If you are looking for a completely free way to manage duplicate files, several high-quality, reputable alternatives exist:
While there are many tools available for finding and removing duplicate files, "Duplicate File Remover 3.10.40"