Shader Override is pinned in the #help channel of the Halo 2 PC discord, but there's no other way to fix it to my knowledge without Project Cartographer or Shader Override.
A common issue with Halo 2 Vista is how on modern Nvidia cards, the anti-aliasing causes white lines on the map. HALO2ShaderOverride fixes this, but causes other issues by breaking transparent object shaders. This fixes the white lines without breaking anything else along with providing higher...