Most modern repacks (like those from FitGirl, DODI, or ElAmigos) follow a similar flow: Verify Files:
Unofficial, pirated files are the easiest way for hackers to distribute trojans, ransomware, and spyware. These can steal personal data or lock your computer.
Support the developers. Buy the game. Or, at the very least, play a free-to-play fighting game. But do not throw away your cybersecurity for a few hours of unpatched, offline boxing. The risk is far greater than the reward.