Works Now with Beta Release

I downloaded from the app store but like others it would not work. It would say that iPhoto had stopped responding, etc. I clicked on the “Send Feedback” link on the bottom right of the application and received a response from support within 24 hours. They supplied me with a link to test a beta version and it worked first time, found 261 duplicates for a total of 7.7 gb. For me the space savings really came from the identification of video duplicates.

Windsor66 about Duplicate Cleaner For iPhoto, v1.7.0