UPDATE 9/26:
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Source:
support.microsoft.com
Check Windows Updates
Direct download links for KB5030217 MSU file from Microsoft Update Catalog:
Download KB5030217 MSU for Windows 11 v21H2 64-bit (x64) - 348.6 MB
Download KB5030217 MSU for Windows 11 v21H2 ARM64 - 469.4 MB
UUP Dump:
64-bit ISO download:
ARM64 ISO download:
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KB5030301 Windows 11 Cumulative Update Preview Build 22000.2482 (21H2)
September 26, 2023 - KB5030301 (OS Build 22000.2482) Preview IMPORTANT After today, September 26, 2023, there will no longer be optional, non-security preview releases for Windows 11, version 21H2. Only cumulative monthly security updates will continue for the supported versions of Windows...

September 12, 2023 - KB5030217 (OS Build 22000.2416)
IMPORTANT After September 26, 2023, there will no longer be optional, non-security preview releases for Windows 11, version 21H2. Only cumulative monthly security updates will continue for the supported versions of Windows 11, version 21H2.
IMPORTANT Some versions of Windows 11, version 21H2 will reach end of service on October 10, 2023. These are Home, Pro, Pro Education, and Pro for Workstation. After October 10, 2023, these devices will not receive monthly security and quality updates. These updates contain protections from the latest security threats.
We will continue to support the remaining editions of Windows 11, version 21H2.
For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 11, version 21H2, see its update history page.
Note Follow @WindowsUpdate to find out when new content is published to the Windows release health dashboard.
Tip: Looking for this month's video? It's now in the Windows 11, version 22H2 article.
Highlights
- This update addresses security issues for your Windows operating system.
Improvements
This security update includes improvements that were a part of update KB5029332 (released August 22, 2023). When you install this KB:
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
- This update addresses an issue that affects authentication. Using a smart card to join or rejoin a computer to an Active Directory domain might fail. This occurs after you install Windows updates dated October 2022 or later. For more details, see KB5020276.
For more information about security vulnerabilities, please refer to the Security Update Guide website and the September 2023 Security Updates.
Windows 11 servicing stack update - 22000.2355
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
How to get this update
Before installing this update
Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
Install this update
Release Channel Available Next Step Windows Update and Microsoft Update Yes None. This update will be downloaded and installed automatically from Windows Update. Windows Update for Business Yes None. This update will be downloaded and installed automatically from Windows Update in accordance with configured policies. Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website. Windows Server Update Services (WSUS) Yes This update will automatically sync with WSUS if you configure Products and Classifications as follows:
Product: Windows 11
Classification: Security Updates
If you want to remove the LCU
To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.
Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.
File information
For a list of the files that are provided in this update, download the file information for cumulative update 5030217.
For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 22000.2355.
Source:
September 12, 2023—KB5030217 (OS Build 22000.2416) - Microsoft Support

Check Windows Updates
Direct download links for KB5030217 MSU file from Microsoft Update Catalog:
Download KB5030217 MSU for Windows 11 v21H2 64-bit (x64) - 348.6 MB
Download KB5030217 MSU for Windows 11 v21H2 ARM64 - 469.4 MB
UUP Dump:
64-bit ISO download:

Select language for Windows 11 (22000.2416) amd64
Select language for Windows 11 (22000.2416) amd64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
www.uup.ee
ARM64 ISO download:

Select language for Windows 11 (22000.2416) arm64
Select language for Windows 11 (22000.2416) arm64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
www.uup.ee

UUP Dump - Download Windows Insider ISO Tutorial
UUP Dump is the most practical and easy way to get ISO images of any Insider Windows 10 or Windows 11 version, as soon as Microsoft has released a new build. UUP Dump creates a download configuration file according to your choices, downloads necessary files directly from Microsoft servers, and...

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