Just download and install MTX, MekTek's free content delivery and updating system. Once installed, simply click the Games Available tab, select Mechwarrior4: Mercenaries and click install. The game will download and install, all within MTX, and as up
This is the updated version of the MTX installer to download the full, free version of Mechwarrior 4: Mercenaries. This new version removes skins to reduce lag, and adds an offline mode.