Error blzbntbna0000000c

Why can’t I use the product I paid my money for? Constant difficulties! Make an offline version of diablo 3 if you can’t properly maintain this product!!!
I do all recommendations, but is not installed - again error blzbntbna0000000c
Diablo 3 not working too !
Upd - It’s been over a month and the problem still remains unanswered. What’s the matter, gentlemen?