2026-11 Security Update (KB5132061)

Install KB5132061’s required prerequisite updates before retrying it; on Windows 11 26H2, this means an update dated September 22, 2026 or later and servicing stack version 26100.9539 or later.^1^

1. Check the Windows version and prerequisites

1. Press Windows key + R, enter winver, and select OK.
2. If it shows Windows 11 26H2:
   • Open Settings > Windows Update.
   • Select Check for updates and install every earlier available update.
   • Restart, then check again until no earlier updates remain.
   • The required baseline is an update released on or after September 22, 2026, such as KB5124010.
3. If it shows 24H2 or 25H2, the required baseline is an update released on or after June 10, 2025.

Next, right-click Start, select Terminal (Admin), and run:

DISM /Online /Get-Packages | findstr /i "ServicingStack"

Check the version shown in the Package Identity result:

• 26H2: 26100.9539 or later
• 24H2/25H2: 26100.4193 or later

If it is older, return to Settings > Windows Update, install all available earlier updates, and restart before attempting KB5132061 again. These prerequisites and versions are specified in the update’s release notes.^1^

2. If Windows Update still fails

Run the Windows Update troubleshooter:

1. Open Settings > System > Troubleshoot > Other troubleshooters.
2. Next to Windows Update, select Run.
3. Apply any recommended fixes, restart, and check for updates again.^2^

Then repair the Windows component store and protected system files. Open Terminal (Admin) and run these commands individually:

DISM.exe /Online /Cleanup-image /Restorehealth
sfc /scannow

Wait for each command to finish, restart Windows, and retry the update. Microsoft documents this repair sequence for persistent Windows Update failures.^3^

3. Manual installation fallback

If the prerequisites are present and the repair commands complete successfully, KB5132061 can be installed from the Microsoft Update Catalog. Select the package matching the PC architecture—normally x64, but Arm64 for an Arm-based PC.

This update can include one or more checkpoint cumulative updates. Download all listed MSU files, put them in an otherwise empty folder such as C:\Packages, and install the checkpoint packages in the listed order before the target update. The release page’s Catalog section provides the applicable files and ordering.^4^

Do not use an x64 package on Arm64 or vice versa.

4. If it continues failing

Open Settings > Windows Update > Update history, select the failed KB5132061 entry, and record the complete hexadecimal error code, such as 0x800f0993. The “retry later” message alone does not identify the failure. Include that code, the Windows version from winver, and the output of the servicing-stack command when requesting further support.

Microsoft’s release notes currently state that Microsoft is not aware of a known issue with this update, so the exact error code is needed to distinguish a prerequisite, servicing, corruption, storage, or permissions failure.^1^

References

1. November 10, 2026—KB5132061 (OS Builds 26300.9974, 26200.9974 and 26100 ...
2. [Windows 11](https://support.microsoft.com/windows/experience/windows-update-troubleshooter)
3. [Windows 11](https://support.microsoft.com/windows/deployment/updates-lifecycle/troubleshoot-problems-updating-windows#repair-hard-drive-errors)
4. [Catalog](https://support.microsoft.com/servicing/os/windows-11/2026/11/kb5132061-windows-11-24h2-25h2-26h2-security-update)