there is no map file in my folder "zone".and i want to connect a server with each map,i see the error :the map file "rust,favela,terminal,..." is not in "zone".even after update my game with launch IW4.please tell me where i can download map files.

I highly consider to reinstall the full version of Modern Warfare 2

You might have downloaded a single player version..(Multiplayer files have been removed to reduce the size)

"i want map files"

And I want a girlfriend with big tits. No seriously, try reinstalling MW2 or download it again (Steam, Pirates, ...).