Critical Blizzard Update Agent files are missing from your computer and the 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 and operating system to resolve any compatibility issues.
Close all other applications to resolve software conflicts and free up resources.
Run a security scan to remove any viruses or malware infections.
Update or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
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