Microsoft urges organizations to avoid installing KB4520062 because it could stall Defender antivirus services.
Microsoft’s second monthly cumulative update on October 15 for Windows 10 version 1809 contained only non-security fixes, but it may cause a security problem for organizations that rely on Windows Defender Advanced Threat Protection (ATP).
Microsoft yesterday began advising organizations running Windows 10 version 1809 PCs and Windows Server 2019 against installing the update KB4520062.
Microsoft released it on October 15 for 1809 along with other versions of Windows 10 as the second update following the October Patch Tuesday update. It is a non-security and optional update.