Unable to Install or Patch Diablo III

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.

If you are receiving a specific error code (such as BLZBNTAGT00000BB8), you can search for the error code at this link. The error code's page will have more specific troubleshooting. If you do not receive an error code, the steps below may resolve problems in which the Battle.net Desktop Application can’t download data or update game files.

1. Configure your security software's exception list to allow Blizzard applications to run.
2. If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
3. Run the repair tool to repair any damaged game files.
4. Update your drivers and operating system to resolve any compatibility issues.
5. Disable any proxies that may interfere with the login module.

If the previous troubleshooting steps didn't resolve the problem, you can ask the Blizzard player community for help on the tech support forums (if available) or other community gaming sites. Local computer or network technicians may also be able to help if you've exhausted all other resources.