Microsoft developers warnedthat some users should not install update KB4520062, released on October 15 of this year as part of “Tuesday updates.” The fact is that it can adversely affect the work of Microsoft Defender and cause problems for organizations that rely on Windows Defender Advanced Threat Protection (ATP) protection.
This warning applies to machines running Windows 10 version 1809 and Windows Server 2019. If you install the ATP update, it may stop working, and you may also have problems sending reports.
KB4520062 was not a security update and was intended to fix the problem that caused a black screen to appear during the first login after installing the update. KB4520062 also solved the Bluetooth-related problem: if certain audio profiles were used for a long time, devices in the Connected Standby mode began to show high power consumption.
It is reported that a fix for this problem will appear only in mid-November 2019, and it is not clear whether the bug will be fixed as part of the next “Tuesday of updates”, or whether it will take longer. So far, users are advised to remove KB4520062 or not to install at all.