Easy Duplicate Finder offers a legitimate trial version so you can test its features safely.
If you need to find and remove duplicate files, there are safe and legal alternatives:
Using unauthorized license keys violates software copyright laws and terms of service, which can lead to legal complications or being banned from using the developer's future products [2]. A Safer Way to Clean Your PC
Cracked versions cannot access official updates. This leaves your system vulnerable to security flaws that the developers have already patched in the legitimate version [2].