This is the Sequel to Act of War Direct Action and does not require the original game to play.
Act of War High Treason is the thrilling continuation of 2005’s best new military RTS, Act of War Direct Action. With its fast-paced, action-packed and well-balanced gameplay, extensive tech tree and amazing visuals, this ultra-realistic modern military RTS was an instant smash hit with reviewers and gamers alike!
With naval combat, tons more multiplayer options, expanded tech trees and a massive new single-player campaign, High Treason contains hundreds of hours of intense RTS gameplay!
Control the ultimate in cutting-edge military technology and units in this first look at tomorrow’s war!

• Massive new features and unit rosters for both single- and multiplayer
• Over 50 multiplayer maps and new single player campaign
• Tons of new multiplayer modes and customization options
• Naval combat with advanced water physics
• Nine different mercenaries to expand the gameplay experience
• Over 50 new units and upgrades
• Enhanced A.I., graphics, artillery and aircraft handling, and much more!

To activate the game, you need a Steam Account

• Login or register at the official
  Steam Website and download Steam client
• Install and start application, login with your Account name and Password
• Click the Games Menu.
• Choose Activate a Product on Steam...
• Follow the onscreen instructions to complete the process
• After the successful code verification, go to the "MY GAMES" tab and start downloading.