Having installed Call of Duty: Modern Warfare, you can play it online and offline at the same time by selectng Go Offline. How Do You Play Multiplayer On Call Of Duty Lan? Steam users can download CoD 4 from the Steam store or from Mega/Mediafire users can download it from the Mega/Mediafire store.
the MP game is 82.1 GIG installed. BUT ,once you run game ,it creates a sneaky shader cache in C:\ProgramData\Activision\Call Of Duty Black Ops that is ,wait for it, another 7.8 GIG. So in order to run the game you need 90 GIGS for MP. The game seems good but I thought the install was smaller. .