The Battle.net Desktop application uses a process called Agent to install and patch Blizzard games. The steps below may resolve problems in which Agent can’t download data or install files.

If your region is currently patching or undergoing maintenance there might be a known issue affecting all players. Check @BlizzardCS on Twitter, or the technical support forums linked at the bottom of this article, for information on any ongoing issues.

  1. Try restarting your computer before continuing with the remaining steps. This is a quick way to close the Agent process and allow the desktop app to update it.
  2. Use a wired connection.
  3. Disable or temporarily remove your security software.
  4. Make sure your operating system is up to date.
  5. The Windows Secondary Logon service must be enabled for Agent to run. Make sure the service is turned on.
  6. Run a security scan to find and resolve any infections.
Advanced Troubleshooting
  1. Delete the Battle.net Tools folder and open the Battle.net desktop app again to download a fresh version of Agent.
  2. Temporarily disable your proxy settings.
  3. Make sure your network is set up properly to allow Agent to connect.
  4. Make sure both your internet browser and Adobe Flash Player are up to date.
  5. Try manually updating the Battle.net Agent.
  6. Uninstall the game and reinstall if none of the steps above resolved your problem.
Note: World of Warcraft addon managers can prevent Agent from updating game files. Disable or temporarily uninstall these programs, restart your computer, and try again.
 

Tried everything here?

If you have tried all of these steps and still require assistance, please visit our Technical Support Forum (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) (Heroes of the Storm) or contact us.