I completely forgot to mention that the unregistered version will NOT move duplicates to the trash (in other words, this is not a fully functional demo of the software.)

Also, it was not readily apparent that to show the list of all duplicate files found required a select-all in the side list of matched groups. The software does not then select the tertiary duplicates (ala the WONDERFUL Utility Dog which is alas for OS 9 only) thus the user must manually select duplicates via shift or control clicking and then select "Move to trash" or press the delete key only to be greeted by a dialog (you could save your users a whole lot of time by letting them know right off the bat that the there is no point in selecting files in this crippled DEMO) stating:

"Advanced Feature
Moving files to the trash is one of Duplicate Catchers advanced features. Woudl you like to be taken to our website to learn more about these features and how to enable them?"

So the primary purpose of the software is an advanced feature? And incidentally, Duplicate "Catchers" should have an apostrophe (Duplicate Catcher's) as it is possessive.