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The Battle.net desktop app is unable to download a file required for installation or patching.

1. Close the Battle.net app and wait for Agent.exe to disappear from Task Manager before relaunching the Battle.net app. If the issue persists, restart your computer and try again.
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 or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
5. Close all other applications to resolve software conflicts and free up resources.
6. Run a security scan to remove any viruses or malware infections.