KB4566116 – Windows 10 1903 Build 18362.1049 & 1909 Build 18363.1049

On 20th August, Microsoft releases the non-security cumulative update for Windows 10 series 1900 – KB4566116. This non-security update increases the build version of Windows 10 1903 to 18362.1049 and 1909 to 18363.1049. With this patch, Microsoft addresses the problem that leads to the Setting page to crash, prevents Cortana Smart lighting from working, and more. Yet now Microsoft is not aware of any issues with this update

You can either download the KB4566116 update manually or let Windows do it for you. In case your patch gets failed or stuck, you can try the manual installation to get the update. To continue, open Windows Settings (Win+I> Update & Security > Windows Update. Then, move to the right pane and select Check for updates. In order to check the complete list of the patch, open Windows 10 Cumulative Updates.

KB4566116 – Changelog for 19H1 and 19H2

Here are the key changes that developers perform on OS Build 18362.1049 & 18363.1049 –


Windows 10, 1903

The key changes of this non-security update are –

  1. Addresses an issue that prevents a delegated user from importing a Group Policy object (GPO) even though the user has the required privilege. 
  2. Works on an issue that causes the hard drive to fill up in certain error situations. 
  3. Updates an issue with pinned Add-ins that cause Microsoft Outlook to become unresponsive. 
  4. Works on a runtime error that causes VB6 to stop working when duplicate windows messages are sent to WindowProc().
  5. Updates time zone information for the Yukon, Canada.
  6. Works on an issue that prevents the deletion of Notification State registries for certain apps even after the user profile is deleted. 
  7. Addresses an issue that prevents Visual Basic 6.0 (VB6) applications from using ListView in MSCOMCTL.OCX after upgrading to Windows 10, version 1903, and later. 
  8. Focus on an issue that causes an application that uses msctf.dll to stop working, and the 0xc0000005 (Access violation) exception appears. 
  9. Addresses an issue that prevents Windows 8.1 apps from projecting to a secondary display when those apps use the StartProjectingAsync API. 
  10. Addresses an issue that prevents Microsoft Gaming Services from starting because of error 15612. 
  11. Works on a visual offset issue on a touchscreen. Edits you make with a pen or finger appear in a different area than expected if the device is connected to an external monitor.  
  12. Focus on an issue that prevents Cortana Smart lighting from working as expected if you shut down the machine while Fast Shutdown is enabled. 
  13. Addresses an issue that causes new child windows to flicker and appear as white squares on server devices that are configured for stark visual contrast. 
  14. Addresses an issue with sourcing the root domain directory partition of a global catalog from a child domain controller (DC) when promoting, un hosting, or rehosting the DC. This might cause LSASS to consume all the available memory on the child DC. This issue is specific to Active Directory forests that contain 100 or more domain controllers. 
  15. Resolves an issue that displays a black screen to Windows Virtual Desktop (WVD) users when they attempt to sign in. 
  16. Addresses an issue with File Explorer’s preview of .msg files when Microsoft Outlook 64-bit is installed. 
  17. Addresses an issue that causes all open Universal Windows Platform (UWP) apps to close unexpectedly. This occurs when their installer calls the Restart Manager to restart File Explorer (explorer.exe). 
  18. Focus on an issue that causes user profile folder names to get excessively long, which might lead to MAX_PATH issues. 
  19. Provides the ability to sync the Microsoft Edge IE Mode unidirectional session cookie when an administrator configures the session cookie. 
  20. Works on an issue that causes the Event Viewer Microsoft Management Console (MMC) to stop working when the secondary monitor is above the primary monitor. An out of bounds exception appears. 
  21. Updates an issue that sends a high volume of events during a real-time session in a short period of time. 
  22. KB4566116 addresses an issue with object performance counters. 
  23. Addresses an issue that causes an error if you open Microsoft OneDrive files on demand when User Experience Virtualization (UE-V) is enabled. To apply this solution, set the following DWORD to 1: “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\UEV\Agent\Configuration\ApplyExplorerCompatFix” 
  24. Works on an issue that causes the promotion of a server to a domain controller to fail. This occurs when the Local Security Authority Subsystem Service (LSASS) process is set as Protected Process Light (PPL). 
  25. Addresses an issue in which AppLocker publisher rules might sometimes prevent applications from loading software modules; this can cause partial application failure. 
  26. Resolves an issue that causes the Settings page to close unexpectedly, which prevents default applications from being set up properly. 
  27. Addresses an issue that causes the configuration of the “Minimum Password Length” Group Policy with more than 14 characters to have no effect. For more information, see KB4557232.
  28. Addresses an issue that generates a “Sync stopped, Can’t encrypt files” error when users attempt to sync their Work Folder. This issue occurs after you configure encrypted Work Folders on the client. 
  29. Focus on an issue that causes the CryptCATAdminCalcHashFromFileHandle() function to leak memory when it’s called. That memory is not reclaimed until the calling application closes. 
  30. Addresses an issue that prevents you from unlocking a device if you typed a space before the username when you first signed in to the device. 
  31. Addresses an issue that causes a system to stop working and generates a 7E stop code. 
  32. KB4566116 updates classification failures caused by the wrong User Principal Name (UPN). 
  33. Addresses an issue with a sleep system call on Glibc-2.31 or later that’s running on a Windows Subsystem for Linux 1 (WSL 1) distribution. 
  34. Adds support for WSL 2; for more information, see WSL 2 Support is coming to Windows 10 Versions 1903 and 1909.
  35. Works on an issue that causes applications to take a long time to open. 
  36. Addresses an issue that might display Processor Frequency as zero (0) for certain processors. 
  37. Addresses an issue that causes delays during shutdown when running the Microsoft Keyboard Filter Service. 
  38. Updates an issue that prevents a host’s virtual private network (VPN) connection from sharing with virtual machines (VM) connected to the Default Switch. 
  39. Addresses an issue that sometimes prevents AppLocker from running an application whose publisher rule allows it to run. 
  40. Works on an issue that fails to log events 4732 and 4733 for Domain-Local group membership changes in certain scenarios. This occurs when you use the “Permissive Modify” control; for example, the Active Directory (AD) PowerShell modules use this control. 
  41. Addresses an issue that might prevent the cluster service from starting and generates the error “2245 (NERR_PasswordTooShort)”. This occurs if you configure the “Minimum Password Length” Group Policy with more than 14 characters. For more information, see KB4557232
  42. KB4566116 resolves an issue that causes the loss of written data when an application opens a file and writes to the end of the file in a shared folder. 
  43. Addresses an issue with Server Message Block (SMB). This issue incorrectly logs the Microsoft-Windows-SMBClient 31013 event in the Microsoft-Windows-SMBClient/Security event log of an SMB client when an SMB server returns STATUS_USER_SESSION_DELETED. It occurs when SMB client users or applications open multiple SMB sessions using the same set of Transmission Control Protocol (TCP) connections on the same SMB server. This issue most likely occurs on Remote Desktop Servers.

Windows 10, 1909

The key changes of this non-security update are –

  • This cumulative update carries all the improvements for Windows 10, version 1903.
  • There is no such additional documentation made for this release.

KB4566116 Known Issues 

Microsoft is currently not aware of any issues with this update

How to Get this Update

To download and install the non-security patch, you can try any of the following channels –

  1. Windows Update: If your computer receives the patch update KB4566116, you will get the related notification automatically. To avoid any lagging problem while updating your device, you must have to download and install the latest SSU KB4569073 first.
  2. Standalone Package: If you can’t wait, navigate to the Microsoft Update Catalog. Then download and run the standalone package that came along with this release. Also, make sure to check your system architecture before you start downloading the .msu file. 
    • Product: Windows 10, version 1903 and 1909
    • Classification: Non-Security Updates


Source – Update Catalog