This error is caused by a problem downloading or writing new update data. Try the following steps to resolve this error.
Disable or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
Run the Blizzard Battle.net Desktop App in Administrator Mode to address many installation, patching, networking, and start-up errors.
Run the repair tool to repair any damaged game files.
Disable any proxies that may interfere with the login module.
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