You can download the software for free to scan your computer. It will show you exactly how many duplicates you have, but it usually restricts the "one-click delete" feature until a license key is entered.
Here is a comprehensive look at everything you need to know about Duplicate Photo Cleaner licenses. What is Duplicate Photo Cleaner? Duplicate Photo Cleaner License Key
To activate a pirated key, these versions often require you to disable your antivirus. This leaves your personal data—and your photos—vulnerable. You can download the software for free to scan your computer