The most reliable method for playing Halo 2 on PC today is through , a community-driven mod that restores multiplayer functionality and fixes compatibility issues for modern Windows systems.
The Halo 2 community is exceptionally active in restoring content that was cut from the original 2004 release: Halo 2 Free Game Download
For a step-by-step walkthrough on setting up the game and its modern multiplayer features, check out this guide: Halo 2 Vista + Project Cartographer Setup Guide! : r/halo TheUncutFighter Reddit• Jan 12, 2018 The most reliable method for playing Halo 2