"An unexpected error occurred while trying to

  • "An unexpected error occurred while trying to install. Please try again or contact Customer Support." is the error I immediately get after accepting the EULA.

    It is different to some errors other users have been encountering. I am from Australia on Windows 7, and if you have the same error - post the location you are from and your operating system.
  • We have a sticky up covering this issue:
    http://us.battle.net/d3/en/forum/topic/4887789564
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    Check your G-diffuser system!