Windows 10 1809 Update KB4493509 OS Build 17763.437

Windows 10 1809 Update KB4493509 OS Build 17763.437 applies to Windows 10 & Windows Server 2019 all versions and released on April 9, 2019.

Windows 10 1809 KB4493509 improvements and fixes

  • 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.
  • Addresses an issue that may cause compound document (OLE) server applications to display embedded objects incorrectly if you use the PatBlt API to place embedded objects into the Windows Metafile (WMF).
  • 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.
  • Addresses an issue with a speech subsystem in Microsoft HoloLens that causes applications to stop responding when there is no Internet connection.
  • Addresses an issue about using provisioning packages to join Azure Active Directory (AAD) domains in bulk when first setting up Microsoft HoloLens.
  • Addresses an issue about application installation notifications on Microsoft HoloLens devices.
  • Addresses an issue about the installation of sideloaded Universal Windows Platform (UWP) apps from Windows Device Portal on Microsoft HoloLens. Sideloaded means the apps are not published in the Microsoft Store.
  • Improves the efficiency of the environment data that Microsoft Azure Spatial Anchors use, which allows you to place spatial anchors in smaller physical locations in Microsoft HoloLens.
  • Addresses an issue that prevents Microsoft HoloLens from connecting to some Windows 10 mobile hotspots.

Only the new fixes contained in this package will be downloaded and installed on your device if you installed earlier updates. See: Windows 10 1809 Update KB4490481 OS Build 17763.404

Known issues in this update

Symptom Workaround
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. This issue is resolved in KB4495667.
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.

  1. Open Windows Deployment Services from Windows Administrative Tools.
  2. Expand Servers and right-click a WDS server.
  3. 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.

Microsoft and ArcaBit have identified an issue on devices with ArcaBit antivirus software installed that may cause the system to become unresponsive upon restart after installing this update. This issue has been resolved. Arcabit has confirmed this issue is not applicable to Window 10, version 1809.
Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege. Do one of the following:

  • Perform the operation from a process that has administrator privilege.
  • Perform the operation from a node that doesn’t have CSV ownership.

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

When attempting to print from Microsoft Edge or other Universal Windows Platform (UWP) applications you may receive the error, “Your printer has experienced an unexpected configuration problem. 0x80070007e.” You can use another browser, such as Internet Explorer to print your documents.

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

After installing KB4493509, devices with some Asian language packs installed may receive the error, “0x800f0982 – PSFX_E_MATCHING_COMPONENT_NOT_FOUND.”
  1. Uninstall and reinstall any recently added language packs.
  2. Select Check for Updates and install the April 2019 Cumulative Update.

Note If reinstalling the language pack does not mitigate the issue, reset your PC as follows:

  1. Go to the Settings app > Recovery.
  2. Select Get Started under the Reset this PC recovery option.
  3. Select Keep my Files.

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

Source: Microsoft

How to Update Windows 10 1809 KB4493509 OS Build 17763.437

Go to the Microsoft Update Catalog then search KB4493509. After it Download and install.