I just downloaded and ran zsDuplicateHunter 2.13. I am using a dual 1 GHz G4, Mac OS X 10.3.8.

The program launched and immediately presented an error dialog. That window was far too wide for my screen (perhaps the developer has a 23" cinema display? I don't.)

"Error initializing help system.
javax.help.HelpSetException: Could not parse
Unknown PublicID -//Sun Microsystems Inc.//DTD JavaHelp HelpSet Version 2.0//EN
The parent tag for name cannot be helpset.
helpset cannot contain text main window.
Unbalanced tag name.
Got an IOException (null)
Parsing failed for jar:file:{path}/zsDuplicateHunter.app/Contents/Resources/Java/help.jar!/zsDuplicateHunter.hs"

The program seemed functional after that point, successfully located duplicates based on checksum (and quickly too) and moved them to the specified folder (recreating the folder path that they came from which is very nice) instead of deleting them. The dialog window warning me that files would be removed was also way to wide for my screen.

On the second launch the Java error dialog occurred again and was still way to wide for the screen. The files will be moved dialog was no longer to wide (which may only have been because the path and filename were shorter than the previously selected files?)

At launch and at exit I was reminded that the software is shareware and that I can purchase it. I like the feature set and might consider purchasing it but there is no way I will fork over my hard earned cash for unfinished, untested, unpolished software - not to this developer, not to Microsoft and not to Apple either. Just my 2¢.