Upgrade Windows 10 21H1 to 21H2 (KB5003791)

It seems that the official Microsoft position to upgrading to 21H2 from 21H1 is to refresh the Windows Update page. I haven't seen any evidence of that of being a viable solution. It is obvious that there is a KB associated with the update but it seemed difficult to track down.

Not only has the appropriate KB been tracked but a process that has tested as a successful solution. Before updating to Windows 10, version 21H2 using an enablement package, you must be running Windows 10, version 2004, 20H2, or 21H1 with a couple of prerequisites.

Method 1

Download the appropriate msu package for KB5003791 directly from Microsoft and double click on the file.

Method 2

Download the appropriate cabinet file for KB5003791 directly from Microsoft and use the dism.exe utility to install.

  • x64: http://b1.download.windowsupdate.com/c/upgr/2021/08/windows10.0-kb5003791-x64_b401cba483b03e20b2331064dd51329af5c72708.cab
  • x86: http://b1.download.windowsupdate.com/c/upgr/2021/08/windows10.0-kb5003791-x86_1bf1a29db06015e9deaefba26cf1f300e8ac18b8.cab
  • arm64: http://b1.download.windowsupdate.com/c/upgr/2021/08/windows10.0-kb5003791-arm64_05c00a882a8cb93b8dc1b94ef8133f909f3cd937.cab


  1. Go to the download.
  2. Hold down the Shift-key on the keyboard, and right-click on the downloaded update file.
  3. Select Copy as Path from the context menu.
  4. Select Start.
  5. Type cmd.exe and run as administrator.
  6. Execute the following command.
    REM DISM.exe /Online /Add-Package /PackagePath:YOURCOPIEDPATH
    DISM.exe /Online /Add-Package /PackagePath:"C:\Users\admin\Downloads\windows10.0-kb5003791-x64_b401cba483b03e20b2331064dd51329af5c72708.cab"
  7. Windows 10 installs the update and prompts you to restart the device.


Windows 10 version 21H2 is installed after the restart. You can check that by selecting Start > Settings > System > About.  Another way is to use Run, type winver and hit OK.


  • https://www.ghacks.net/2021/09/03/how-to-upgrade-windows-10-version-21h1-to-21h2-right-now-kb5003791/
  • https://support.microsoft.com/en-us/topic/kb5003791-update-to-windows-10-version-21h2-by-using-an-enablement-package-8bc077be-18d7-4aac-81ce-6f6dad2cd384
  • https://www.reddit.com/r/Windows10/comments/palzga/featureupdate_21h2_enablement_package_download/
  • https://www.reddit.com/r/Windows10/comments/qvenhp/windows_10_21h2_19044_launch_megathread/