March 31, 2026—KB5086672 (OS Builds 26200.8117 and 26100.8117) Out-of-band
Applies To
Release Date:
31/3/2026
Version:
OS Builds 26200.8117 and 26100.8117
This out-of-band update for Windows 11, version 25H2 and 24H2 (KB5086672) is cumulative and includes updates from previous security and non-security releases.
This update includes the improvements and features that were introduced in the March 26, 2026 non-security preview update (KB5079391), along with a fix for an installation issue that affected some devices attempting to install that update.Â
Improvements
This out-of-band update contains quality improvements from KB5079473 (released March 10, 2026), KB5085516 (released March 21, 2026), and KB5079391 (released March 26, 2026 - no longer offered). The following summary outlines key issues addressed by this out-of-band update. The bold text within the brackets indicates the item or area of the change.
-
[Setup] Fixed: While installing the March 2026 Windows preview update (KB5079391), some devices running Windows 11, version 25H2 or 24H2, might encounter the following error:
Some update files are missing or have problems. We'll try to download the update again later. Error code: (0x80073712)
This out-of-band update is offered through Windows Update for devices running Windows 11 that have already installed KB5079473 or a later update. It is also available for manual download from the Microsoft Update Catalog.
Devices that have Get the latest updates as soon as they’re available turned on may see this update offered automatically through Windows Update when it becomes available for their device. If this setting is turned off, you can install the update manually by going to Settings > Windows Update and selecting Download & install.
Note: IT administrators using Microsoft Intune or Windows Autopatch should follow the guidance below for installing the out-of-band update via Windows Update.Â
AI Components
This release updates the following AI components:
|
AI Component |
Version |
|
Image Search |
1.2603.377.0 |
|
Content Extraction |
1.2603.377.0 |
|
Semantic Analysis |
1.2603.377.0 |
|
Settings Model |
1.2603.377.0 |
Windows 11 servicing stack update (KB5079387)-Â 26100.8112
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
How to get this update
Before you install this update
Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
|
Available |
Next Step |
|
|
|
Open Start  > Settings > Windows Update. > Advanced options > Optional updates. In the Optional updates available area, you will find the link to download and install available updates. |
|
Available |
Next Step |
|
|
See the other options. |
|
Available |
Next Step |
|
|
To install this release from the Microsoft Update Catalog, select the option that matches your device architecture (arm64 or x64), and then follow the instructions. |
Before you install this update, the standalone package(s) for this update is available from the Microsoft Update Catalog website. This KB contains one or more MSU files that require installation in a specific order.
You can install this update using Method 1 (install all MSU files together) or Method 2 (install each MSU file individually, in order).
Method 1: Install all MSU files together
Download all MSU files for KB5086672 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages). Use Deployment Image Servicing and Management (DISM.exe) to install the target update. DISM will use the folder specified in PackagePath to discover and install one or more prerequisite MSU files as needed.
Updating Windows PC
To apply this update to a running Windows PC, run the following command from an elevated Command Prompt:
|
DISM /Online /Add-Package /PackagePath:c:\packages\Windows11.0-KB5086672-arm64.msu |
Or, run the following command from an elevated Windows PowerShell prompt:
|
Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5086672-arm64.msu"​​​​​​​ |
Or use Windows Update Standalone Installer to install the target update.
Updating Windows Installation media
To apply this update to Windows Installation media, see Update Windows installation media with Dynamic Update.
Note:Â Â When downloading other Dynamic Update packages, ensure they match the same month as this KB. If the SafeOS Dynamic Update or Setup Dynamic Update is not available for the same month as this KB, use the most recently published version of each.
​​​​​​​To add this update to a mounted image, run the following command from an elevated Command Prompt:
|
DISM /Image:mountdir /Add-Package /PackagePath:Windows11.0-KB5086672-arm64.msu |
Or, run the following command from an elevated Windows PowerShell prompt:
|
Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-KB5086672-arm64​​​​​​​.msu" -PreventPending |
​​​​​​​Method 2: Install each MSU file individually, in order
Download and install each MSU file individually either using DISM or Windows Update Standalone Installer in the following order:
-
windows11.0-kb5043080-arm64_df540a05f9b118e339c5520f4090bb5d450f090b.msu
-
windows11.0-kb5086672-arm64_3fc90ac2758378deaedd977ef86a9c3b61431a3e.msuÂ
|
Note:Â This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server. |
​​​​​​​Before you install this update, the standalone package(s) for this update is available from the Microsoft Update Catalog website. This KB contains one or more MSU files that require installation in a specific order.
You can install this update using Method 1 (install all MSU files together) or Method 2 (install each MSU file individually, in order).
Method 1: Install all MSU files together
Download all MSU files for KB5086672 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages). Use Deployment Image Servicing and Management (DISM.exe) to install the target update. DISM will use the folder specified in PackagePath to discover and install one or more prerequisite MSU files as needed.
Updating Windows PC
To apply this update to a running Windows PC, run the following command from an elevated Command Prompt:
|
DISM /Online /Add-Package /PackagePath:c:\packages\Windows11.0-KB5086672-x64.msu |
​​​​​Or, run the following command from an elevated Windows PowerShell prompt:
|
​​​​​​​Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5086672-x64.msu" |
Or use Windows Update Standalone Installer to install the target update.
Updating Windows Installation media
To apply this update to Windows Installation media, see Update Windows installation media with Dynamic Update.
Note:Â When downloading other Dynamic Update packages, ensure they match the same month as this KB. If the SafeOS Dynamic Update or Setup Dynamic Update is not available for the same month as this KB, use the most recently published version of each.
To add this update to a mounted image, run the following command from an elevated Command Prompt:
|
DISM /Image:mountdir /Add-Package /PackagePath:Windows11.0-KB5086672-x64.msu |
​​​​​​​Or, run the following command from an elevated Windows PowerShell prompt:
|
Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-KB5086672-x64.msu" -PreventPending |
​​​​​​​Method 2: Install each MSU file individually, in order
Download and install each MSU file individually either using DISM or Windows Update Standalone Installer in the following order:
-
windows11.0-kb5043080-x64_953449672073f8fb99badb4cc6d5d7849b9c83e8.msu
-
windows11.0-kb5086672-x64_52aef89bc1afc5e67eec927556ec6926122936ad.msu
|
Note:Â This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server. |
|
Available |
Next Step |
|
|
See the other options. |
If you want to remove the LCU
Before you decide to remove the LCU, see Understanding the risks: Why you should not uninstall security updates.
To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.
Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.
File information
For a list of the files provided in this update, download the file information for out-of-band update 5086672.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5079387) - version 26100.8112.
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