End of an Era: Windows 10 Receives Final Cumulative Update (KB5066791) as Support Officially Ends
Microsoft has released the final cumulative update for Windows 10 — KB5066791, officially ending mainstream support for this version of the operating system. The update, part of October’s security release, marks the conclusion of free patches and technical assistance for the general public.
Although standard servicing has now ended, Microsoft will continue to provide extended security updates — one additional year for home users and up to three years for enterprise customers.
In the EMEA region — encompassing Europe, the Middle East, and Africa — the first year of extended updates will be offered free of charge. However, without an active subscription, systems will no longer receive security patches or technical support, even though they will remain operational. Microsoft strongly recommends that users transition to Windows 11 as soon as possible.
The KB5066791 update is mandatory and includes the October Patch Tuesday rollout, which addresses six critical zero-day vulnerabilities and over 170 additional issues. The patch will install automatically once updates are checked through the system settings, though users may manually select a convenient restart time to complete installation.
After applying the update, Windows 10 version 22H2 will advance to build 19045.6456, while version 21H2 will move to build 19044.6456. Manual downloads are also available through the Microsoft Update Catalog.
Among the most notable improvements are an updated servicing stack with a new certificate chain, enhanced Azure environment validation, and the removal of the ltmdm64.sys driver, previously used for fax modems — which are now officially unsupported.
The update also resolves issues with the Chinese IME input editor, which had caused incorrect character rendering, and fixes display errors involving surrogate character pairs in text fields constrained by length limits.
Additional fixes include the correction of timeout errors during PowerShell and WinRM command execution, restored SMBv1 protocol stability when accessing network resources via NetBIOS over TCP/IP, and a resolved Autopilot registration status page bug encountered during automated deployment of Windows 10 22H2 on new devices.
The complete list of fixes can be found in the KB5066791 update bulletin, as well as in the preview update KB5066198 released last month. Microsoft notes that no known issues have been identified with this update at the time of publication.
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