As such, you will have to download the mod separately from Halo Online. With that being said, when you download the Halo Online files and the El Dewrito mod, you just need to put them both in the same folder, make sure everything is extracted, and run ElDewrito updater. Halo Online (ElDewrito) is a fan made community driven Halo game based on the official (cancelled) Halo Online game which allows players to take part in a wide variety of highly customizable multiplayer Halo matches.
0.5.0.1
DOWNLOAD ONE OF THE THREE LINKS BELOW!
Extract, Run DewritoUpdater.exe, and click 'Play' (If it takes too long to validate just skip it).
Use your arrow keys on the menu and 'Enter' or 'A' to select and to go back you press 'B'.
Don't worry about the IRC Error.
Fixed AMD Shader Bugs, both NVIDIA and AMD users redownload the game.
Removed unused/duplicates tags.
This will break forge maps, and some mods.
Halo Online How To Download Correctly
You can copy your configs from 0.5.0 folder to the new 0.5.0.1 folder.