The original online multiplayer requires Steam. A "better" compressed version often includes or Plutonium —custom launchers that allow LAN play and offline bot matches. This is superior to the vanilla version because you can play multiplayer forever without Activision servers.
Before you download, it's crucial to make sure your PC can run the game. The original online multiplayer requires Steam
Essential files like high-quality textures, cinematic audio, and multiplayer maps are often deleted to save space. The original online multiplayer requires Steam