Error code

Blizzard BLZBNTAGT000008A4

BLIZZARDBLZBNTAGT000008A4
Game/Platform Error· An error code shown by a game or gaming platform/launcher.

What it means

The Battle.net desktop app is unable to download a file required for installation or patching..

How to fix it

  1. Check Battle.net service status.
  2. Close the Battle.net app and wait for Agent.exe to exit Task Manager then relaunch.
  3. Optimize your internet connection (prefer wired).
  4. Change the download region in Battle.net settings.
  5. Flush DNS (ipconfig /flushdns) and reset Winsock.
  6. Configure antivirus exceptions.
  7. Uninstall and reinstall the Battle.net app.

Not affiliated with Blizzard. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.