To install the Red Hammer campaign :

1. Open up your "ARMA: Cold War Assault" or "Operation Flashpoint Cold War Crisis / Resistance" directory.


As examples : the "Arma: Cold War Assault" directory default location for windows7+ running steam is  C:\Program Files (x86)\Steam\SteamApps\common\ARMA Cold War Assault


and the "Operation Flashpoint" directory defalut location is  C:\Program Files\Codemasters\Operation Flashpoint


2. Cut and paste "redhammer.pbo" into the "Campaigns" folder.


3. Cut and paste "VoiceRH.pbo" into the "AddOns" folder.