An internal error has occurred. If this problem persists, please contact Customer Support.
Error Codes: BLZBNTBNA00000004

The Battle.net client is trying to install a product or a language pack that isn't supported. Follow the steps below to resolve the issue.

  1. Restart your computer and attempt the installation again.
  2. Modified or corrupted files can cause this error. Uninstall and reinstall the Battle.net Desktop app and try again. 

Tried everything here?

If the steps above did not resolve your issue, please make a post on our Battle.net Technical Support Forums and be prepared to give us your Setup and Update Agent logs.