Getting desperate trying to install this game

Technical Support
I predownloaded the files a few weeks ago and now I keep getting the "Unexpected error" when trying to install. I've tried every fix listed and every combination of folders within folders. I've deleted the battle.net folder, rebooted my computer, shut down every background app...

How do I install Diablo 3 and why is it such a difficult process?
Me too. Tried all the fixes. So bummed. I took two days off work to play this!
i'm having the same problem :s

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