21H221H120H2
Installing KB5012599 will upgrade the operating system’s build to 1904X.1645. Before we dig into what’s new with this flight, we must intimate you that Windows 10 version 20H2 will reach the end of service on May 10, 2022. This rule is applicable to editions Home, Professional, Pro Education, and Pro for Workstations. Therefore, we recommend that you upgrade your versions to keep your system protected from zero-day security vulnerabilities. KB5012599 does not bring any significant features to the OS but does offer many fixes and improvements.
Fixes and Improvements
Since this is a cumulative update, only the updates not included in the prior flights will be installed if you have already installed them.
Fixes and Improvements Known Issues Download and Install Windows 10 KB5012599 Through Windows Update Download KB5012599 Offline Installers For Windows 10 Version 21H2 For Windows 10 Version 21H1 For Windows 10 Version 20H2 Rollback/Remove Windows 10 Cumulative Update Cleanup After Installing Windows Updates
KB5012599 includes all the fixes and improvements offered in KB5011543, which was released just 3 weeks ago. Apart from those, an additional improvement is the inclusion of a security patch that causes a Denial of Service vulnerability in Cluster Shared Volumes (CSV). That being said, the update also has some known issues.
Known Issues
An issue with the standalone (clean) installation of Windows 10 with this update is causing Microsoft Edge Legacy to be removed. However, it is not being replaced by the new Chromium-based Edge. This occurs only when Windows has a custom offline media or an ISO image installed that does not include the 29th March 2021 SSU update. Microsoft suggests that you either install the March SSU update through slipstreaming or simply update an existing OS through Windows Update, so you will not be facing this issue. Alternatively, you can simply download and install the new Microsoft Edge if you have already encountered this problem. Another issue that users might face with this update is that they are unable to install it entirely. This may be because of a previously installed update KB5003690. If that is the case, you can find a workaround for it here in Microsoft’s post. Users may also see an error message “Your credentials did not work. The credentials that were used to connect to (device name) did not work. Please enter new credentials” when connecting to devices in an untrusted domain using Remote Desktop while using smart card authentication. Microsoft has found a temporary fix around the issue which you can find here. Any recovery discs created after installing these updates using the Backup and Restore (Windows 7) feature may not work. This issue does not only apply to this release but to any updates released after the Windows 11 January 11, 2022 update. Microsoft also adds that the recovery discs created before installing the mentioned updates are not affected. However, there is currently no fix for the problem. Microsoft is working on this issue and intends to fix it in a future flight. We have noticed that these issues have been around for Windows 10 for quite some time now. However, Microsoft has not been successful at fixing them as of yet.
Download and Install Windows 10 KB5012599
Through Windows Update
To install this update via Windows Update, you need to be running Windows 10 version 21H2, 21H1, or 20H2. To check your version of the operating system, type in winver in the Run Command box and press Enter. If you have the desired version, perform the following steps to upgrade your OS right now: Once the computer reboots, the update will be successfully installed. To confirm this, check the updated build number by typing in winver in the Run Command box. Click Install now.
Download KB5012599 Offline Installers
To download KB5012599 MSU offline installers, click on the respective link below:
For Windows 10 Version 21H2
Download KB5012599 for Windows 10 Version 21H2 64-Bit [661.4 MB] Download KB5012599 for Windows 10 Version 21H2 32-Bit [312.4 MB]
For Windows 10 Version 21H1
Download KB5012599 for Windows 10 Version 21H1 64-Bit [661.4 MB] Download KB5012599 for Windows 10 Version 21H1 32-Bit [312.4 MB]
For Windows 10 Version 20H2
Download KB5012599 for Windows 10 Version 20H2 64-Bit [661.4 MB] Download KB5012599 for Windows 10 Version 20H2 32-Bit [312.4 MB] To install the update, simply run the downloaded MSU file and Windows will automatically install the update. To download any other updates related to any of the above, please check the Microsoft Catalog.
Rollback/Remove Windows 10 Cumulative Update
If you do not wish to keep the installed update for some reason, you can always roll back to the previous build of the OS. However, this can only be performed within the next 10 days after installing the new update. To roll back after 10 days, you will need to apply this trick.
Cleanup After Installing Windows Updates
If you want to save space after installing Windows updates, you can run the following commands one after the other in Command Prompt with administrative privileges:
