The Blizzard Update Agent couldn't modify necessary files on your hard drive. This usually happens when the required files are locked or in use by another program. Follow the steps below to resolve the issue.
Restart your computer to resolve problems caused by programs and services running in the background.
Update or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
Try closing background applications to resolve any software conflicts.
Run the Blizzard Battle.net Desktop App in Administrator Mode to address many installation, patching, networking, and start-up errors.
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