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In a web browser, head to https://battle.net/account/management/claim-code.html
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Create or log in to your Blizzard account where you would like to redeem your code.
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Click your username from the upper right corner, and select ‘Account Settings’.
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Enter your unique code that’s displayed on the ‘Order’ page of your D2games account or on the link of your confirmation email if you had purchased as a guest. Click ‘Redeem Code’ and the follow the prompts to download the game to your PC.
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You can launch the game using the Battle.net Desktop App found here: https://us.battle.net/support/en/article/25949
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You can find additional support with the Blizzard.net activation process and client here: https://us.battle.net/support/en/help