Hello,this tutorial will explain how to proceed to have MW2 Multiplayer alterIWnet Version running in some minutes(depending on your download speed xD)
How to proceed
Download the attachment,it contains the alterIWnet Client torrent.
When downloaded,unzip the package anywhere you want.
Now go to the Client folder,and run "alterIWnet_configure.exe",choose your nickname and save.
To launch the game use iw4mp.exe
Done,simple thing,but not everyone knows how to do it