Battlefield 3: End Game is the fifth expansion pack for Battlefield 3. This expansion brings a balance of infantry, vehicles and new DLC weapon platform extras to the battlefield. In alignment with previous expansions this DLC introduces four new maps that are in harmony with the new weapons, game modes, and style of game play. Game mode additions for this expansion offer one new type: Air Superiority and a returning classic mode, capture the flag.Go to: http://www.origin.com/us/about
Click “Download Origin” (from the upper left corner)
Login into downloaded application
Install and start application, login with your Account name and Password
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Redeem Product Code
From the “Origin” drop-down menu (upper right corner) choose “Redeem Product Code…”,
enter your code and click “Next”.
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After successful code verification go to the “MY GAMES” tab and start downloading.