Look for old game forums or subreddits dedicated to retro gaming or game cracking communities. They might have threads linking to or discussing such versions.

And then Liberty City went dark. But Leo still swears, sometimes, when rain hits his apartment window at just the right angle, he can hear the faint sound of a cell phone ringing. A mission waiting to be accepted. A perfect rip, living on in the static.

These versions used registry scripts ( .reg files) that "injected" the necessary game data into your Windows Registry without a formal installer, allowing the game to run instantly from any folder. The Risks: "Drunken Cam" and Malware

: Indicates the game is "portable"—it can be played directly after extraction without a formal installation process that writes to system registries.

A list of for a specific PC build?