Microsoft shipped the December 9, 2025 cumulative update, KB5072033, for Windows 11 versions 24H2 and 25H2. It pushes the two servicing streams to OS builds 26100.7462 and 26200.7462, respectively. What sets this month’s release apart is that it arrives as a combined package: a servicing stack update (SSU) and the latest cumulative update (LCU) bound together in a single payload. That packaging choice changes how you install the patch, and it carries rollback consequences anyone managing Windows devices should understand.

The update, available through Windows Update and the Microsoft Update Catalog, continues Microsoft’s recent practice of gating certain user-facing features server-side or by hardware entitlement. But the underlying binaries include the usual assortment of security hardening, quality improvements, and reliability fixes that define a monthly cumulative.

What’s inside the December 2025 cumulative

KB5072033 targets both the General Availability Channel (24H2) and the Copilot+ optimized 25H2 branch. After applying the update, your device will show:

  • Windows 11 24H2: build 26100.7462
  • Windows 11 25H2: build 26200.7462

The payload bundles several categories of fixes, most of which Microsoft previously flighted through Release Preview and optional preview updates:

  • Platform and kernel stability improvements, including sign-in reliability and LSASS hardening.
  • Driver compatibility updates that touch graphics, networking, and docking station behavior.
  • UI and accessibility polish carried forward from recent preview builds.
  • AI and Copilot+ PC components, though these remain gated by hardware and entitlement—not every device will see the full Copilot experience even after this update.

However, the headline for anyone who handles manual deployments is not the feature list. It’s how the update is packaged.

Why this update is different: the SSU factor

Microsoft has combined the servicing stack update and the cumulative update into a single bundle. That means the SSU—the component responsible for installing and managing other updates—ships inside the same .msu file as the LCU. Previously, you might have seen separate packages or explicit prerequisite chains. Now there’s one body that carries both.

Two practical consequences follow:

  1. Install reliability improves for Windows Update clients because the SSU is already present when the LCU tries to apply. This reduces a class of failures where an outdated servicing stack choked on a newer cumulative.
  2. Rollback becomes less straightforward. If you uninstall the LCU, the SSU portion may remain on the system. Organizations that depend on a full, clean rollback to a pre-patch state must account for persistent servicing stack artifacts that can affect WinRE and SafeOS components.

Microsoft’s documentation acknowledges the permanence of the SSU and advises keeping recovery media or an in-place repair path ready.

How to install KB5072033 without getting stuck

Microsoft gives two documented ways to apply the update offline, plus the usual automatic Windows Update route for online devices. Both offline methods rely on .msu files downloaded from the Microsoft Update Catalog.

Method 1: Let DISM discover prerequisites (recommended for most manual installs)

  • Download all .msu files listed for KB5072033 from the Update Catalog into one folder—for example, C:\Packages.
  • From an elevated Command Prompt, run:
    DISM /Online /Add-Package /PackagePath:C:\Packages\Windows11.0-KB5072033-x64.msu
  • DISM automatically detects and applies any prerequisite MSUs in the same folder before installing the target update.
  • Restart when prompted and verify the build with winver.

The equivalent PowerShell command is:

Add-WindowsPackage -Online -PackagePath "C:\Packages\Windows11.0-KB5072033-x64.msu"

Method 2: Install each MSU individually, in order

  • Microsoft explicitly lists two files that must be installed in sequence:
    1. windows11.0-kb5043080-x64.msu (a prerequisite checkpoint cumulative)
    2. windows11.0-kb5072033-x64.msu (the December 2025 LCU)
  • You can use DISM /Online /Add-Package or the Windows Update Standalone Installer (wusa.exe) for each file, in that order.
  • Skipping or reversing the order can trigger servicing errors, including the widely reported “Operation is not supported” failure.

For IT teams that maintain offline Windows images, the same packages can be injected into a mounted WIM:

DISM /Image:C:\mount /Add-Package /PackagePath:Windows11.0-KB5072033-x64.msu

Microsoft further stresses that if you’re updating installation media, you must use Dynamic Update packages from the same month as the cumulative—or, if none are available, the latest SafeOS and Setup Dynamic Update packages.

Guidance for home users vs. IT pros

For home users: The simplest path is Windows Update. Open Settings → Windows Update → Check for updates, and let the system offer KB5072033 automatically. The update will download and install the combined SSU+LCU in the correct order without manual intervention. Reboot when prompted, and you’re done. Unless you have a specific reason to use the Catalog, there’s no need to complicate the process.

For administrators: This update demands more planning.

  • Pilot ring strategy. Because kernel-level and driver-facing changes are included, you should test KB5072033 on a representative set of hardware before broad rollout. Include at least one machine per major OEM model, plus any systems with critical dock/GPU/Hyper-V configurations.
  • Rollback readiness. Because the SSU may not roll back cleanly, have bootable recovery media or an in-place repair ISO tested and available. If you must revert, an in-place upgrade repair is often safer than uninstalling the update.
  • Imaging and deployment. Integrate KB5072033 into your gold images and, if you maintain installation media, import the matching Dynamic Update packages. This keeps WinRE and setup behavior consistent with the patched state.
  • Offline or air-gapped environments. Use the folder-based DISM method to avoid prerequisite ordering mistakes. And always verify the integrity of downloaded .msu files—Catalog mirrors occasionally host corrupted payloads.

For developers: The update includes platform stability fixes that can affect kernel-mode debugging and driver development. If you rely on low-level tooling, validate your workflows on a test machine with the new build before pushing patches to production development systems.

Common install failures and fixes

Manual installation from the Catalog has tripped up many users in previous months. Here are the recurring trouble spots and their countermeasures.

“Operation is not supported”

This error often appears when a prerequisite LCU (like KB5043080) is missing or damaged. If you hit it, try:

  1. Re-downloading windows11.0-kb5043080-x64.msu and placing it in the same folder as the KB5072033 MSU.
  2. Using the folder-based DISM command from an elevated prompt.
  3. If that fails, install the prerequisite manually first, then the target update.
  4. As a last resort, switch to Windows Update—it sidesteps the prerequisite detection issue by handling ordering internally.

Incomplete or corrupted .msu files

Always compare the file hash against Microsoft’s published values if you suspect corruption. A fresh download from the Catalog often resolves unexplained install hangs.

Driver regressions

GPU, network, and docking firmware conflicts remain the most common post-update complaints. If a device becomes unstable after the patch:

  • Boot into Safe Mode and remove the offending driver via Device Manager.
  • Reinstall the latest driver from the OEM’s website or use a clean installer like DDU for GPU stacks.
  • Check Microsoft’s Known Issue Rollback policy documentation—sometimes a Group Policy setting can temporarily disable a problematic feature while a permanent fix is developed.

Servicing stack rollback fails

If uninstalling KB5072033 through Settings leaves the system in a mixed state, run DISM /Online /Cleanup-Image /RestoreHealth and SFC /scannow to repair the component store. In extreme cases, use an in-place upgrade repair with installation media of the same edition and language.

What comes next

Microsoft’s shift toward combined SSU+LCU packages is likely permanent. Future cumulative updates will probably continue this model for both 24H2 and 25H2, especially as Copilot+ PC features graduate from preview gates to broad availability.

For now, treat KB5072033 as a standard monthly quality update with an extra packaging twist. Home users can let Windows Update handle everything. Administrators should stage carefully, lean on the folder-based DISM approach for offline installs, and have a recovery plan ready—just as they would for any large cumulative. The real test will come when organizations deploy images built with the combined SSU and later attempt a full rollback: those edge cases will reveal whether the servicing stack’s permanence causes operational pain.

As always, the best defense is a small pilot ring, 48–72 hours of monitoring, and a healthy reluctance to rush a mass deployment until telemetry signals stability. With KB5072033, that playbook hasn’t changed—even if the packaging has.