The Battle.net desktop app is a launcher application for Battle.net 2.0 games, including World of Warcraft, which replaced the Blizzard Launcher. An initial version was released in August 2013. The application unifies the login procedure for all supported games, essentially removing the need to re-enter account, password, and authenticator information when logging into a game, and is capable. Blizzard Battle.net Desktop application is free to download and offers easy-to-install, easy-to-use, secure, and reliable Games applications. Blizzard Battle.net Desktop is a very fast, small, compact and innovative Freeware Games for Windows PC.

So yesterday I decided to download Heroes of the Storm again, but my Battle.net was stuck at calculating space and then going blank with installation window, so I thought of doing a reinstallation of a Battle.net desktop app and it only went downwards from then onward.

Battle Net Desktop App Won't Install

The Battle.net desktop app only supports direct chat with BattleTag and Real ID friends. If a character friend from World of Warcraft or StarCraft II attempts to message you, you will not receive any notification in the Battle.net app—just in-game.

Uninstalling was completed easily. Then, when I tried installing again the window got stuck at 'Updating Battle.net Update Agent' at approx 40-50% of the bar. Then after another few dozen tries it changed to showing ' BLZBNTAGT000008FC' error after being stuck on 40-50% of Updating Battle.net Update Agent.

Now, I’ve been searching the forums far and wide and some things.
I’ve killed agent.exe before trying again.
I’ve cleared all temporary folders from Battle.net and Blizzard Entertainment folders.
I’ve cleared %ProgramData%.
I’ve reset WMI repository - which is recommended for shown error.
I’ve tried using no antivirus (honestly having to uninstall it instead of adding something to exceptions should never be required).

Battle Net Desktop App Update

Nothing helped. I did try to rollback entire Windows10 back to yesterday before I started trying to download HOTS, but all I got now is “Required application data could not be found” system error.

Battle Net Desktop App

So now I can’t play Starcraft II that was working perfectly before I tried to have fun with friends in HOTS and I am left with nothing but a broken Battle.net desktop app that seems to be beyond possibility of repair.

Is there anything I could try?