Call of Duty: Modern Warfare III on Steam. In the direct sequel to the record-breaking Call of Duty: Modern Warfare II, Captain Price and Task Force 141 face off against the ultimate threat.How do I download MW3 for PC?1Sign in to the Battle app.2Click on the "Games" tab.3Select "All Games"4Click on "Call of Duty"5Press "Install"6Press "Continue"7Select "Modern Warfare III"8Press "Start Install"
