Crashing Battle.net app via during game installation

Whoops! Looks like something broke. Give it another shot.​ Error Code : BLZBNTAGT00000BB8

I started Battle.net app, started installation of CoD: WarZone
It has been installing game (like 1-2 GB) and later the Battle.net app crashed.
I started the app again and started download, that started Scaning My Files (Scan and Repair) and showed me NOTIFICATION of ERROR like UP. I tried everything on Blizzard Support and it couldnt help :confused: What i must to do ?? Help please.

same issue here and so far no one has had it fixed