Ingame autoupdate will not work

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If you bought game on steam, it will automatically install the required patches for the game, after that you will need to fix iw3mp.exe file. Download theiw3mp.exe fix file. Call of Duty 4: Modern Warfare PC Security Update Copy the file and paste it inside game directory where you installed the game. If you are not sure where your game is, go to your steam library, find COD4 and right click on it, click on "Manage" -> "Browse local files", it will open up your COD4 directory so paste the iw3mp.exe fix file there. Last thing to do is installing cod4x version. The guide on “how to” is below at 4th embed.