I have experienced the same issue for the last few days and have tried every suggestion in the thread besides upgrading from windows 8 to 10 and still no dice. I’ll be asking for a refund at this point. It’s really disappointing that Blizz hasn’t come up with some sort of comprehensive answer even months later. I’m willing to post any details requested by tech support but based on the previous blue posts above I doubt I’ll be getting any.