Go to: http://us.battle.net/account
Under "My Game Accounts" you should have Diablo 3. Click on it.
Under "ACCOUNT STATUS", it should say "ACTIVE". If so, you are good to go, and already activated.
The installer simply asks you to activate if you haven't already. So you can tell it you are activated, and it will proceed normally.
This can be caused by an incorrect region being set. To change Region to Americas just click on the 'Pre download game client' on the right hand side and after the age screen you can change from Global or EU to US
Ellyn, from what I can tell you have a region issue that can result in that error. Some people were defaulted to EU for some reason and had to go back and download again. Make sure you select Americas!This can be caused by an incorrect region being set. To change Region to Americas just click on the 'Pre download game client' on the right hand side and after the age screen you can change from Global or EU to US
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