Windows 11 21H2 dynamic update KB5022370 (Jan. 19, 2023)

Windows[German]Small addendum from this week: Microsoft has released the dynamic update KB5022370 for Windows 11 21H2 on January 19, 2023. The goal of this update is to improve setup errors and the installation process.  Dynamic update KB5022370 replaces version KB5020379, which was released on November 15, 2022. Here is a brief overview of what there is to know.


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The dynamic update KB5022370 can be loaded on demand and run from setup during Windows 11 installation when an Internet connection is available. It is available for the following Windows 11 versions.

  • Windows 11 SE, version 21H2
  • Windows 11 Home und Pro, version 21H2
  • Windows 11 Enterprise and Education, version 21H2
  • Windows 11 IoT Enterprise, version 21H2

The update will also be available for download from the Microsoft Update Catalog and could be included in installation media or imported into WSUS. Microsoft writes about the update:

This update contains improvements to Setup binaries or to files that Setup uses for feature updates in Windows 11, version 21H2.

Support article KB5022370 contains a list of corrected files that are dated December 13, 2022. This ranges from acres.dll to appraiser.dll to winsetup.dll and UpdateAgent.dll. There are no prerequisites to install the update, and a reboot is not required.

Background dynamic updates

Dynamic updates were introduced by Microsoft with Windows 10 to be able to integrate them dynamically when upgrading (feature update) from one operating system version to a higher version. For example, if you call the Media Creation Tool to create an installation disk, you will be asked whether you want to download and integrate updates. Also, when upgrading (feature update) to a new Windows build, the setup will ask if you want to download updates.

This Technet post provides some information about 'Dynamic Updates' for Windows 10. Dynamic Updates can include the following:


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  • Setup Updates: Fixes to Setup binaries or any files that Setup uses for feature updates.
  • Safe OS Updates: Fixes for the "safe OS" that are used to update Windows recovery environment (WinRE).
  • Servicing Stack Updates: Fixes that are necessary to address the Windows 10 servicing stack issue and thus required to complete the feature update.
  • Latest Cumulative Update: Installs the latest cumulative quality update.
  • Driver Updates: Latest version of applicable drivers that have already been published by manufacturers into Windows Update and specifically targeted for Dynamic Update.

In addition to these updates, Dynamic Update retains the content of Language Packs (LP) and Features on Demand (FODs) during the upgrade process. These are not updates to LPs and FODs, but are a new purchase to ensure that the user has these items available when the update is completed.


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