UPDATE
I found I had an old expired version, After deleting old version, I downloaded again and it works fine. This is one of the better Duplicate File Finders, Easy to add on more folders to scan again. It also has the reassuring thumbnail to make sure both files are really duplicates and not just similar names and file size. Finding duplicates is also really fast. Well worth the selling price, though I was hoping for a special Sharewareonsale discount.