Content creators and theorycrafters use repacks to test talent builds, simulate gear scaling, or scout raid routes before playing on a live server.
: Ensure no other programs (like XAMPP or Skype) are using port 3306.
Legion is considered a "mid-to-high" difficulty expansion for emulator developers. Unlike Wrath of the Lich King (which is nearly 99% scripted) or The Burning Crusade , Legion emulation is still considered a work in progress in many areas.
If you tell me which specific repack you downloaded, I can help you with the exact configuration steps or link you to the community discord for that project.