He turned to Reddit, where a community of GTA IV preservationists welcomed him. There, he learned that while GTA IV’s base version hasn't been sold on modern storefronts, the 1.0.4.0 patch was actually the before Rockstar retired the title. It addressed frame rate issues and optimized modding compatibility. Marcus found his answer: buy a used copy on Steam, where collectors occasionally sell legacy GTA games, and apply the patch via Rockstar’s archived support pages.