KB5003637 Cumulative Update for Windows 10 21H1, 20H2, and 2004

Today is Patch Tuesday and you must be wondering if any new cumulative update becomes available for your PC or not. Well, Microsoft does release a cumulative update i.e. KB5003637 for Windows 10 versions 21H1, 20H2, and 2004. This is wholly a security patch, so don’t expect it to fix any existing bugs or errors on your computer. 

As we stated earlier, we are going to discuss what’s new in this release, known issues, and ways to install it on your device. This is a successor of the update KB5003214 that came on 25th May. 

KB5003637 Cumulative Update for Windows 10 21H1, 20H2, and 2004

KB5003637 Changelog

Here are the key changes that you will notice after installing “KB5003637” on your PC –

Since the changelog of this cumulative update is not available on the Microsoft official site, we are unable to fetch the same for you. However, we have listed a few that we have come to know till now –

  • Enhances the Build number of respective Windows 10 version 21H1, 20H2, and 2004 to 19043.1052, 19042.1052, and 19041.1052 respectively. 
  • With this, Taskbar’s feature – “News and interests” is now available for everyone.
  • Improves the security of all the following –
Microsoft Scripting Engine, Windows App Platform and Frameworks, 
Windows Input and Composition, Windows Management, 
Windows Cloud Infrastructure, Windows Authentication, 
Windows Fundamentals, Windows Virtualization, Windows Kernel, 
Windows HTML Platform, and Windows Storage and Filesystems.

Known Issues on KB5003637

So far, we have come to know the following issues on this cumulative update –

  • Error 0x800f0988 – Try applying the Servicing Stack update that comes in the month of May 2021. If the error persists even after this, follow this tutorial
  • You may encounter an error code 0x800f0922 after you uninstall Microsoft Edge from your device. To fix it, you need to re-install the Chromium-based Edge browser. 
  • A small subset of users has complained of getting lower performance than they were used to after installing this patch. You might feel the issue as well if you play games on a full screen or on borderless windows modes. As per Microsoft, this problem would automatically be resolved after a PC reboot. In case, the problem persists even after this, try installing a special group policy developed by Microsoft to tackle such errors. 

How to download and install KB5003637 

If you have already installed May 2021 SSU i.e. (KB5003173), you are supposed to do nothing. Else, visit Microsoft Update Catalog, and download/install this servicing stack update to your PC first. 

After you apply the above SSU to your computer, follow these steps to download KB5003637 –

  • Open Microsoft Update Catalog, and type “KB5003637” in the text field.
  • Press Enter and you will get a list of available updates.


  • Pick the one that best matches your system configuration and hit the Download button.
  • When a pop-up window comes up, hit the top link. The cumulative update download begins shortly afterward.
  • After the download completes, double-click the setup file to begin its installation. 
  • Your PC may restart several times during this patch installation. 

Alternatively, you may also get the KB5003637 update via the Windows Update section as well. All you require is to visit the below path and hit the Check for Updates button.

Settings (Win + I) > Update & Security > Windows Update

That would be all for now.

Release Note

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