This article covers unexpected Blizzard Update Agent errors.
We're having trouble starting the Battle.net desktop app. Please try again. If the problem persists, try restarting your computer.
Your installation could not be started. Please try again.
Troubleshooting step for connection-related problems on Windows.
This error means Battle.net Agent (the process that installs and patches our games) couldn't stream necessary files.
Standalone patches are downloaded outside of the game launcher or the Battle.net desktop app.