Blizzard servers could not be reached or may be offline.
What to do if a friend or family member has access to your account and has updated the account details, are preventing you from accessing the account, or has taken gold or items.
This error occurs when the Battle.net Setup program does not have permission to install the game on your computer.
Information about promoting guild members to officer ranks with the authenticator requirement enabled
Troubleshooting a scenario where your Blizzard games are uninstalled every time you restart the computer