KB4586781 for Windows 10 2004 19041.630 and 20H2 19042.630

The latest cumulative update KB4586781 for Windows 10 2004 19041.630 and 20H2 19042.630 is rolling out.


Windows 10 20H2 and 2004 are going to receive a new LCU. KB4586781 is the Cumulative update taking the version to 19042.630  or 19041.630.

However, any official confirmation has come out just now. As the updates are rolling out we will update the information here. Microsoft is distributing the update through WSUS as of now. See – Windows 10 Cumulative Updates List.

KB4586781 for Windows 10 2004 and 20H2

Here is the changelog –

Windows 10 20H2

  1. This build contains all the improvements from Windows 10 2004.
  2. No additional issues are listed for this release.

Windows 10 2004

This LCU Updates 2020 DST start date for Fiji Islands to Dec 20, 2020.

The patch contains Security updates to the Microsoft Scripting Engine, Windows Input and Composition, Microsoft Graphics Component, the Windows Wallet Service, Windows Fundamentals, and the Windows Kernel.

Known issues

Symptom Workaround
IME users for Chinese and Japanese languages might encounter issues when trying different tasks. Furthermore, you might have problems with input, get unexpected results, or might not be able to enter text. For detail, workaround steps, and the current fixed issues, kindly visit KB4564002
User and System and certificates might be missing when updating a device from Windows 10 1809, or greater to a greater version of Windows 10. The problem will impact only the Devices that have already installed any LCU released on 16 Sept 2020, or later. Additionally, they proceed to update to a greater version of Windows 10 using media or an installation source that does not have an LCU released October 13, 2020, or later integrated. This first and foremost happens when managed devices are updated via outdated bundles or media through an update management tool, for example, Windows WSUS or Microsoft Endpoint Configuration Manager. Moreover, this might occur when using old ISO images or physical media that don’t have the most recent updates integrated.

Remark – Devices that connect straight to “Windows Update” or use Windows Update for Business are not impacted. Any device connecting to Windows Update should always get the latest feature update, including the latest cumulative update, without any additional steps.

If you have already experienced, mitigate it within the uninstall window by returning to the previous Windows version using the guidelines in this section. The uninstall windows might be 30 or 10 days based on the setting of the environment and the version you are updating to. You will then need to update to the greater Windows 10 version after the problem is fixed in your environment.

Remark – From the uninstall window, you can change the number of days you have to return back to your previous Windows 10 version using the DISM command /Set-OSUninstallWindow. You must change this before the default uninstall windows has expired. For more details, see DISM operating system uninstall command-line options.

They are working on a fix and will push refreshed media and  updated bundles in the forthcoming weeks.

How to install this LCU

Before installing this LCU, receive SSU  KB4586864 and then follow any of the methods  –

1. Using Windows update automatically

  1. Click the Start and type – updates.
  2. Hit – Enter.
  3. Select the – Check for updates.
  4. Allow the download of the patch to finish and click the – Install now.

1. Via Microsoft update catalog

  1. Go to KB4586781 direct download link
  2. Select the correct file suitable for your system architecture and click the – Download.
  3. Right click the file and select Open.
  4. Follow the instructions appearing on your screen.

Direct Download links – – x64, x86

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Topics:  Windows update
About Sunita
Love to play with Windows 11 and 10. Suggestion - Going for Registry change or system files edit then remember to take a backup or create a restore point before Starting.