There was a server-side issue downloading a required file.

This error occurs when the Battle.net Setup program does not have permission to install the game on your computer.

Blizzard servers could not be reached or may be offline. 

Information on error BLZBNTAGT0000084A

Information on error BLZBNTAGT00000846

Information on error BLZBNTAGT00000849

Troubleshooting for error BLZBNTBGS80000011.

Something went wrong while logging you in. This can happen when we don’t have permission to read or write files on your computer.

Information on error BLZBNTAGT00000841

Troubleshooting a scenario where your Blizzard games are uninstalled every time you restart the computer