Critical Blizzard Update Agent files are missing from your computer and the Blizzard Battle.net desktop app can't download new copies. Follow the steps below to resolve the problem.
Restart your computer to resolve problems caused by programs and services running in the background.
Update your drivers to resolve any compatibility issues.
Try closing background applications to resolve any software conflicts.
Run a security scan to remove any viruses or malware infections.
Disable or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
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