August 13, 2019—KB4512501 (OS Build 17134.950)

The Windows 10 April 2018 Update will reach end of service on November 12, 2019 for Home and Pro editions. We will begin updating devices running the Windows 10 April 2018 Update starting July 16, 2019 to help ensure that these devices remain in a serviced and secure state. For more information, see the Windows 10, version 1903 section of the release information dashboard.

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**Reminder:**March 12 and April 9 were the last two Delta updates for Windows 10, version 1803. Security and quality updates will continue to be available via the express and full cumulative update packages. For more information on this change please visit our blog.

Starting with update KB4499183, we are introducing functionality that allows you to decide when to install a feature update. You control when you get a feature update while simultaneously keeping your devices up to date. Feature updates that are available for eligible devices will appear in a separate module on the Windows Update page (Settings> Update & Security >Windows Update). If you would like to get an available update right away, selectDownload and install now. To find out more about this feature, please go to this blog. When Windows 10 devices are at, or within several months of reaching, end of service, Windows Update will begin to automatically initiate a feature update. This keeps those devices supported and receiving the monthly updates that are critical to device security and ecosystem health.

For more information about the various types of Windows updates, such as critical, security, driver, service packs, etc., please see the following article.

Highlights

• Updates to improve security when using Internet Explorer, Microsoft Edge, Bluetooth, networking technologies, and input devices such as a mouse, keyboard, or stylus.

Improvements and fixes

This securityupdate includes quality improvements. Key changes include:

• Addresses an issue that may prevent devices from starting up or cause them to continue restarting if they are connected to a domain that is configured to use MIT Kerberos realms. Domain controllers and domain members are both affected.
• Security updates to Windows Wireless Networking, Windows Storage and Filesystems, Windows App Platform and Frameworks, Windows Datacenter Networking, Microsoft JET Database Engine, Windows Input and Composition, Windows MSXML, Internet Explorer, Windows Server, Microsoft Scripting Engine, Windows Cryptography, Windows Server, Windows Virtualization, Microsoft Edge, and Windows Shell.
  If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

Known issues in this update

• 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.
  We are investigating reports that a small number of devices may startup to a black screen during the first logon after installing updates.| This issue is resolved in KB4519978.
  Devices that start up using Preboot Execution Environment (PXE) images from Windows Deployment Services (WDS) or System Center Configuration Manager (SCCM) may fail to start with the error “Status: 0xc0000001, Info: A required device isn’t connected or can’t be accessed” after installing this update on a WDS server.| This issue is resolved in KB4512509.
  After installing this update, applications that were made using Visual Basic 6 (VB6), macros using Visual Basic for Applications (VBA), and scripts or apps using Visual Basic Scripting Edition (VBScript) may stop responding and you may receive an “invalid procedure call error.”| This issue is resolved in KB4512509. This optional update is now available on the following release channels:

• Microsoft Update Catalog.

• Windows Update.

• Microsoft Update.

• Windows Server Update Services (WSUS).
  As with any optional update, you will need to Check for updates to receive and install the update.Note Windows Update for Business customers should apply the update using the Microsoft Update Catalog or Windows Server Update Services (WSUS).
  After installing this update, Windows Mixed Reality Portal users may intermittently receive a “15-5” error code. In some cases, Windows Mixed Reality Portal may report that the headset is sleeping and pressing “Wake up” may appear to produce no action.| This issue is resolved in KB4519978.

How to get this update