This is the gold standard for MWR. It is a client (like IW4x for MW2) that allows for dedicated servers, improved graphics settings, and unlocks all DLC and weapons. It works with most clean installs of the game.
The room dissolved.
📌 : The CODEX version often lacks the automatic cloud updates of the official Steam version, so manual configuration of the config.cfg file (found in the players2 folder) is sometimes necessary for high-end optimization. If you'd like, I can help you: callofdutymodernwarfareremasteredcodex better
Following these steps makes the CODEX version than the official release for campaign replayability. This is the gold standard for MWR