The Blizzard Store allows gamers to download digital copies of Blizzard video games and install them on their computers. Some of the older game downloads require a "game key" before the game can be installed; newer games don't require a CD key. Any game with a game key purchased through the Blizzard Store or registered with the website will have the access code saved on the user's account page.
Instructions
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1
Browse to the Battle.net website, which is the backbone of Blizzard's online services.
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2
Click "Log in" at the top of the page and sign in to your Blizzard account.
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3
Click "Account." On the right, you will see a listing of your game accounts.
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4
Click the game for which you want the key. Here you can see the game key, and you can download the game's client.