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EDIT :-
https://support.halowaypoint.com/hc/en-us/articles/23707515298324-Halo-The-Master-Chief-Collection-MCC-Update-February-2024
Latest release: February 28, 2025 – Easy Anti-Cheat Maintenance
Resolved Issues
This update includes maintenance for the Easy Anti-Cheat implementation in Halo: The Master Chief Collection. Although Easy Anti-Cheat is primarily active in the PC release of Halo: The Master Chief Collection, the changes included in this update require a download on Xbox consoles as well.
Known Issues
With this update, the team has added a new issue to the Halo: Combat Evolved Known Issues list:
When playing on Steam Deck with Easy Anti-Cheat enabled, players may experience Easy Anti-Cheat error messages when playing Halo: Combat Evolved campaign missions.
When these errors occur, players may encounter issues such as being disconnected from the game's online services or not receiving Achievements.
Download Size by Platform
Xbox consoles: approximately 1 GB or less
Microsoft Store app or Xbox app on PC: approximately 137 GB or less
Steam: approximately 105 MB or less
are they adding halo 5 or something?
Look at: Latest release: February 28, 2025 – Easy Anti-Cheat Maintenance
https://support.halowaypoint.com/hc/en-us/articles/23707515298324-Halo-The-Master-Chief-Collection-MCC-Update-February-2024
The website ♥♥♥♥♥♥ up on my end but they're clearly lying since it's actually a 10.5GB update, meaning way more than a mere EAC patch.
Who knows. All I know is i'm tired of it making it impossible to actually know the update size these days. Bad enough some games do actively just update every file even if not needed.
Shows just how BAD things are @ Microshaft
=
"With this update, the team has added a new issue to the Halo: Combat Evolved Known Issues list:
When playing on Steam Deck with Easy Anti-Cheat enabled, players may experience Easy Anti-Cheat error messages when playing Halo: Combat Evolved campaign missions.
When these errors occur, players may encounter issues such as being disconnected from the game's online services or not receiving Achievements."
it is just a EAC maintenance update that borks the game for Steam Deck users