These files are notorious for carrying malware or keyloggers that can compromise your Mac and your personal data [1].

If you aren't ready to buy, VirtualDJ is actually free for home use (non-commercial) on your computer without a controller [2]. It’s the best way to practice your transitions and learn the interface without risking your hardware.

Sources:[1] Why you should avoid cracked software (common security risks)[2] VirtualDJ Official - Comparison of Licenses and Features

VirtualDJ is professional software. Cracked versions often crash mid-set because they can't handle the real-time processing requirements [1].