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It is recommended to pick the one that’s closest to you geographically. Head to Steam > Settings > Downloads > Download Region. Some Steam servers may be over-encumbered with the number of people trying to use them, so could be a good idea to (temporarily) adjust your Steam region to see if it will do any good.
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In case of any discrepancies, Steam will do its best to repair your installation. This compares your local files with the files on the download server. Right-click on your Call of Duty: Modern Warfare 2 game in the Steam Library, hit Properties > Local Files > Verify Integrity of Game Files. This is a well-known troubleshooting step. To do so, Open Steam, and in the top bar, click Steam > Settings > Downloads > Clear Download Cache. The customer support trope “Have you tried turning it off and on again?” actually helps in some cases. To do so, head to our Is COD MW2 Down? How to Check Modern Warfare 2 Server Status guide.
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Check if the Call of Duty: Modern Warfare 2 servers are down.
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