Old versions were offline-first. They never "phoned home" to check for updates. A "free" old version means no nag screens, no ads, and no forced obsolescence.
The original, authentic Game Killer was generally free, but many clones exist. Alternatives to Game Killer (No Root Needed) game killer no root old version free
Use GameGuardian inside a rooted emulator (like LDPlayer or Bluestacks with root toggle). It’s the modern spiritual successor to Game Killer. Old versions were offline-first