Windows 10 21H2 Archives

Winsage

November 4, 2025

Microsoft wrongly tells supported Windows 10 PCs they’re out of support, nudges Windows 11

Microsoft has acknowledged a bug affecting some Windows 10 users, incorrectly notifying them that their systems are “out of support.” Users can extend their Windows 10 support at no cost until October 13, 2026. The misleading message appears even when the user’s PC remains fully supported. This issue potentially impacts users on Windows 10 Pro, Enterprise, Education editions with ESU enabled, as well as Windows 10 Enterprise LTSC 2021 and IoT Enterprise LTSC 2021. Users will continue to receive updates if they are on Windows 10 LTSC or linked to ESU. Microsoft is rolling out a server-side fix for the false alert, which is expected to disappear within 24 to 48 hours. Users can verify their installed version or edition by navigating to Settings > System > About. Microsoft has provided a rollback option for IT administrators to address this issue.

Winsage

September 10, 2025

Microsoft fixes streaming issues triggered by Windows updates

Microsoft has resolved lag and stuttering issues with NDI streaming software on Windows 10 and Windows 11 systems that occurred after the August 2025 security updates. Users reported severe performance problems, particularly with RUDP connections, linked to updates KB5063878 and KB5063709. Microsoft released updates KB5065426 and KB5065429 to fix these issues and recommended users install them. A temporary workaround involves changing the NDI Receive Mode to TCP or UDP. The September 2025 updates also addressed additional issues related to User Account Control prompts and app installation difficulties for non-admin users, as well as problems with security updates failing via WSUS and disruptions to Windows reset and recovery operations.

Winsage

September 9, 2025

Windows 10 KB5065429 update includes 14 changes and fixes

Microsoft has released the KB5065429 cumulative update for Windows 10 22H2 and 21H2, which includes fourteen enhancements and fixes. This mandatory update addresses two zero-day vulnerabilities and 81 other flaws, improving the security of the operating system. Users can install the update through Windows Update, and it will automatically begin installation after checking for updates. The update upgrades Windows 10 22H2 to build 19045.6332 and Windows 10 21H2 to build 19044.6332. Key fixes include resolving unexpected User Account Control prompts, performance issues with NDI streaming software, and various other bug fixes related to input methods, app compatibility, multimedia, and search functionality. There are no known issues with this update.

Winsage

September 5, 2025

Windows asks for admin rights where it shouldn’t after patch

Microsoft's August 2025 Windows Security Update aimed to fix a critical vulnerability (CVE-2025-50173) related to the Windows Installer, which allowed for privilege escalation. The update enforced User Account Control (UAC) prompts for administrator credentials during MSI repair operations, causing disruptions for standard users and leading to issues such as Error 1730 during the installation of Office Professional Plus 2010. This problem affects nearly all supported editions of Windows, including Windows Server 2012 and 2012 R2. Microsoft suggested running applications with administrative privileges as a workaround and recommended configuring the Known Issue Rollback (KIR) group policy, applicable only to specific Windows versions. Future updates are planned to allow certain applications to perform MSI repairs without UAC prompts.

Winsage

August 23, 2025

Microsoft: August Windows updates cause severe streaming issues

Microsoft has acknowledged significant performance issues related to the August 2025 security updates, particularly affecting NDI streaming software on Windows 10 and Windows 11 systems. Users have reported severe lag and stuttering when using streaming applications like OBS. The issues include "severe stuttering, lag, and choppy audio/video" during streaming or transferring audio/video feeds after installing the updates KB5063878 for Windows 11 24H2 and KB5063709 for Windows 10 21H2/22H2. The NDI team confirmed that these updates cause unexpected drops in NDI traffic, specifically affecting RUDP connections. A temporary workaround involves changing the NDI Receive Mode to TCP or UDP. Additionally, Microsoft recognized other issues from the updates, including failures in security updates via WSUS and problems with Windows reset and recovery operations. Feedback has also been solicited regarding failure and data corruption issues affecting SSDs and HDDs on Windows 11 24H2 systems after the updates.

Winsage

August 22, 2025

Microsoft admits that Windows and NDI are not getting along

Microsoft has acknowledged a complication from the Windows 11 August 2025 Security Update that affects streaming applications, causing "severe stuttering, lag, and choppy audio/video" when using the Network Device Interface (NDI). This issue impacts popular streaming software like OBS and NDI Tools, particularly when the 'Display Capture' feature is activated. The problem affects various Windows versions, including Windows 11 24H2, Windows 10 22H2, and Windows 10 21H2, and is rooted in the Reliable User Datagram Protocol (RUDP). Microsoft suggests switching to TCP or standard UDP as a workaround or uninstalling the update, though the latter carries risks. Users who have not yet installed the update are advised to postpone installation until a resolution is provided, but no timeline for a fix is currently available.

Winsage

July 9, 2025

Windows 10 KB5062554 cumulative update released with 13 changes, fixes

Microsoft has released the KB5062554 cumulative update for Windows 10 22H2 and 21H2, which includes thirteen new fixes and enhancements. This mandatory update addresses one critical zero-day vulnerability and 136 other flaws, and users can install it by checking for updates in the Windows Update settings. After installation, Windows 10 22H2 will be updated to build 19045.6093 and Windows 10 21H2 to build 19044.6093. The update features various fixes, including issues with the Start Menu, file server responsiveness, and USB-connected printers. A known issue with the update is that NOTO fonts may appear blurry at 96 DPI, particularly affecting CJK text in Chromium-based browsers, with a suggested workaround of adjusting display scaling to 125% or 150%.

Winsage

June 10, 2025

Windows 10 KB5060533 cumulative update released with 7 changes, fixes

Microsoft has released the KB5060533 cumulative update for Windows 10 22H2 and 21H2, which includes security patches addressing seven zero-day vulnerabilities. The update reintroduces seconds to the time display in the Calendar flyout, enhances the Rich Calendar feature, and adds descriptive text for the Weather button. It fixes rendering issues with GB18030 characters and resolves a problem with the Windows Account Sync Consent system in the European Economic Area. The update also addresses a known issue causing Hyper-V virtual machines to freeze or restart unexpectedly. A current issue involves blurry NOTO fonts at 96 DPI in Chromium-based browsers, with a workaround of adjusting display scaling to 125% or 150%. After installation, Windows 10 22H2 will be upgraded to build 19045.5965 and Windows 10 21H2 to build 19044.5965. Users can manually download the update from the Microsoft Update Catalog.

Winsage

May 17, 2025

9 Months Later, Microsoft Finally Fixes Linux Dual-Booting Bug

In August 2024, a security update aimed at improving Secure Boot disrupted dual-booting of Windows and Linux due to a vulnerability in the GRUB bootloader. This allowed malicious actors to bypass Secure Boot protections. Microsoft released a patch, KB5058385, on May 13, 2025, to resolve the issue by enhancing the Secure Boot Advanced Targeting (SBAT) system's ability to recognize legitimate Linux bootloaders, preventing them from being blocked. The patch is applicable to various versions of Windows, including Windows 11 (multiple versions) and Windows Server (multiple versions). The update will be automatically applied through Windows Update for affected installations.

Winsage

April 22, 2025

Windows 10 LTSC – the version that won’t expire for years

The end of support for Windows 10 is approaching in October, but two editions will remain supported for two and seven more years, respectively. Windows 10 LTSC 2021 will receive mainstream support until January 12, 2027, and Windows 10 IoT Enterprise LTSC 2021 until January 13, 2032. LTSC versions lack the Windows Store and many modern applications, offering a streamlined experience with essential features only. Activation of LTSC editions requires an enterprise product key, obtainable through a Volume License Agreement. The IoT version is limited to US English, while the standard LTSC supports 38 languages. LTSC editions do not receive version upgrades, remaining on version 21H2 indefinitely. LTSC ISO files are not readily available on the Microsoft download page but can be accessed through the Microsoft portal with an enterprise license. Unauthorized third-party Windows distributions, such as Tiny11 and Atlas OS, exist but may violate Microsoft’s terms of service.