DayZ is a gritty, authentic, open-world survival horror hybrid-MMO game, in which you follow a single goal: to survive in the harsh post-apocalyptic landscape as long as they can. There are no superficial tips, waypoints, built in tutorials or help given to players. Every decision matters, there are no save games, no extra lives, every mistake can be lethal. If you fail, you lose everything and you need to play again from the beginning with nothing but your wits, and your two hands. Fight the hostile environment, where every other player can be friend or foe and nothing can be taken for granted. This is DayZ, this is your story.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.