From the FAQ:

> If some eligible files were found, the amount of disk space that can be reclaimed is shown next to the “Potential Savings” label. To proceed any further, you will have to make a purchase. Once the app’s full functionality is unlocked, a “Review Files” button will become available after a successful scan. This will open the Review Window.

I half remember this being discussed on ATP; the logic being that if you have the list of files, you will just go and de-dupe them yourself.