Windows 10 May 2019 Update

Download Cumulative Update KB4493509 (OS Build 17763.437) for windows 10 1809

A new cumulative update KB4493509 was available for windows 10 1809 (October 2018 Update) with multiple quality improvements designed to address a number of issues affecting the previous OS build. Installing KB4493509 bumps the OS to Windows 10 Build 17763.437 and bring patch security vulnerabilities in the operating system, including in Edge and Internet Explorer, but also in the WSL, the Scripting engine, and other components. Also, the latest update fixes several known issues including EUDC blue screen, MXSML6 stop responding, Group Policy Editor stops responding, WININET.DLL. And still, have few know issues as well.


Download Cumulative update KB4493509

If you are running Latest Windows 10 1809 Cumulative update KB4493509 Automatically Download and Install on your Device via windows update. Also, you can force Windows Update from Settings, Update & Security check for updates to manually install KB4493509 (OS Build 17763.437).

Windows 10 Build 17763.437

Windows 10 Build 17763.437 Offline Download link:

If you are looking for the latest Windows 10 1809 ISO click here.

What’s new Windows 10 Build 17763.437

The latest patch for Windows 10 version 1809 include both security and non-security fixes, and it also comprises all the improvements released in the last few updates. According to the Microsoft support site, Windows 10 Build 17763.437 contains the following changelog.

  • Addresses an issue that occurs when you enable per font end-user-defined characters (EUDC). The system will stop working and a blue screen will appear at startup. This is not a common setting in non-Asian regions.
  • Addresses an issue that may cause applications that use MSXML6 to stop responding if an exception was thrown during node operations.
  • Addresses an issue that causes the Group Policy editor to stop responding when editing a Group Policy Object (GPO) that contains Group Policy Preferences (GPP) for Internet Explorer 10 Internet settings.
  • Addresses an issue that may cause authentication issues for Internet Explorer 11 and other applications that use WININET.DLL. This occurs when two or more people use the same user account for multiple, concurrent login sessions on the same Windows Server machine, including Remote Desktop Protocol (RDP) and Terminal Server logons.
  • Security updates to Windows Datacenter Networking, Windows Server, the Microsoft JET Database Engine, Windows Kernel, Windows Input and Composition, Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Storage and Filesystems, Microsoft Graphics Component, Windows Virtualization, Windows MSXML, Windows SQL components, and Microsoft Edge.

Known issues KB4493509:

After installing this update, Custom URI Schemes for Application Protocol handlers may not start the corresponding application for local intranet and trusted sites on Internet Explorer.

As a temporary solution, Microsoft suggests Enable Protected Mode in Internet Explorer for local intranet and trusted sites.

  1. Go to Tools > Internet options > Security.
  2. Within Select a zone to view or change security settings, select Local intranet and then select Enable Protected Mode.
  3. Select Trusted sites and then select Enable Protected Mode.
  4. Select OK.

Issue 2 :

After installing this update, there may be issues using the Preboot Execution Environment (PXE) to start a device from a Windows Deployment Services (WDS) server configured to use Variable Window Extension. This may cause the connection to the WDS server to terminate prematurely while downloading the image. This issue does not affect clients or devices that are not using Variable Window Extension.

To mitigate the issue, disable the Variable Window Extension on WDS server using one of the following options:

Option 1:
Open an Administrator Command prompt and type the following:

Wdsutil /Set-TransportServer /EnableTftpVariableWindowExtension:No

Option 2:
Use the Windows Deployment Services UI.

Open Windows Deployment Services from Windows Administrative Tools.
Expand Servers and right-click a WDS server.
Open its properties and clear the Enable Variable Window Extension box on the TFTP tab.
Option 3:
Set the following registry value to 0:


Restart the WDSServer service after disabling the Variable Window Extension.

Microsoft is working on a resolution and will provide an update in an upcoming release.

If you face any difficulty installing KB4493509 update, windows update stuck downloading, KB4493509 update failed to install Check our Windows 10 1809 update troubleshooting guide.

Also Read:

Source Microsoft
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