WE ARE SORRY...
Dear Deadzone players,
at least for now, PC and Mac versions were discontinued due to incoming release of the community version of Shadowgun: Deadzone.
Players who used standalone PC version and still wish to play on PC can use the Facebook App to play the game from now on. You can continue in your previous progress by simply using your username and password to Custom Login in the the Facebook App.
You can access facebook app here (please select "Login with Custom Account" option and use your username and password).