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Support Forum Agent
Diablo 3 will ask for an authentication key any time it is installed. That authentication key does not need to be added unless you're installing for the first time with a boxed copy of the game.
If you've done a digital purchase or signed up for the Annual pass, then your key will already be on your Battle.net account. Merely skip this step and let the installer proceed.
Want to speak with someone directly? http://us.blizzard.com/en-us/company/about/contact.html
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