Fix Battle.net Installation Errors on Windows

Quick answer: Close Battle.net and Blizzard Update Agent in Task Manager, uninstall the Battle.net desktop app, remove only Blizzard’s documented app/cache folders, restart Windows, and download a fresh installer from Blizzard. Uninstalling the desktop app does not remove installed games.

Before you start

• Keep the folders containing your installed games.
• Close every Blizzard game and launcher window.
• Make sure Windows has free space and pending updates are installed.

Cleanly reinstall Battle.net

1. End Blizzard processes: Open Task Manager and end Battle.net, Agent.exe, or Blizzard Update Agent if they remain after closing the launcher.
2. Uninstall the desktop app: Open Settings > Apps > Installed apps, select Battle.net, and choose Uninstall. Do not uninstall the games.
3. Clear the documented cache: Press Win+R, open %ProgramData%, and remove the Blizzard Entertainment cache folder after confirming Blizzard processes are closed.
4. Remove a leftover app folder only: If Battle.net remains under %LocalAppData% after uninstalling, rename it to Battle.net.old. Do not delete game-installation folders.
5. Restart Windows: This releases installer files and restarts Windows Installer services.
6. Download from Blizzard: Use Blizzard’s official Battle.net desktop-app download, right-click the installer, choose Run as administrator for this installation, and let it finish.
7. Locate existing games: If the launcher does not detect them, use Locate the game instead of downloading the game again.

Why this works

An incomplete installer can leave a locked Agent process, stale cache, or damaged launcher configuration. A clean app uninstall plus cache reset forces Battle.net to rebuild those files while leaving large game folders intact.

Alternatives

• Try a different Windows administrator account if the installer cannot write to the profile.
• Temporarily disable a VPN or proxy, then re-enable it after installation.
• If the message includes a BLZBNT code, use Blizzard’s code-specific support article.
• Run Microsoft’s Windows Installer troubleshooter if other applications also fail to install.

Warnings and reversal

Do not delete every folder named Blizzard or Battle.net across the drive. The source video shows removal from Program Files; this guide limits cleanup to the desktop app and documented cache so game data is preserved. To undo the LocalAppData test, close Battle.net, delete the newly created folder, and rename Battle.net.old back.

FAQ

Will uninstalling Battle.net delete my games?

No. Blizzard states that uninstalling the desktop app does not uninstall game clients.

Can I download the installer from another site?

No. Use Blizzard’s official download to avoid modified installers.

Why does the installer stop at the same percentage?

A stuck Agent process, stale cache, security block, proxy, or Windows account permission can cause repeat failures.

Official references

• Blizzard: Uninstalling the Battle.net desktop app
• Blizzard: Deleting the Battle.net cache folder
• Blizzard: Download Battle.net

Source video

The video demonstrates a fresh launcher reinstall. This guide narrows deletion to Blizzard’s documented app and cache locations and keeps installed games intact.

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