Windows 10 October 2025 Update: Build 19045.6456 (KB5066791) Released

Windows 10 October 2025 Update: Build 19045.6456 (KB5066791) Released

Final Update for Windows 10 22H2: Build 19045.6456

The last cumulative update for Windows 10 version 22H2 has arrived as build 19045.6456 (KB5066791) on October 14, 2025. This update introduces a few general improvements and fixes, but lacks any major new features. With the end of official support for Windows 10 set for today, this marks the final update the OS will receive in the public domain.

Overview of Build 19045.6456

As part of the October 2025 security update rollout in the Stable Channel, build 19045.6456 is primarily focused on resolving existing issues to enhance user experience rather than introducing significant new functionality. Users looking to maintain security updates beyond today should opt into Microsoft’s Extended Security Updates (ESU) program.

Highlights of General Improvements

This cumulative update resolves several issues highlighted in previous releases. Notable fixes include:

  • SMBv1 Connectivity: Addressed a bug from KB5065429 that hindered access to shared files via SMBv1 protocols.
  • Autopilot ESP Loading Issue: Resolved problems with the Enrollment Status Page during the Out-of-Box Experience for 22H2 deployments via Autopilot.
  • Input Method Improvement: Corrected discrepancies with the Chinese Input Method Editor (IME) that affected private Unicode characters for compliance with GB18030 standards.
  • Windows Remote Management (WinRM): Fixed timeouts for commands in PowerShell Remoting and WinRM that occurred after 600 seconds.
  • Fax Modem Update: The update removes the ltmdm64.sys driver, rendering certain fax modems incompatible with the OS.

Compatibility with Earlier Versions

In addition to the final update for 22H2, older Windows 10 versions are also receiving important updates:

  • Windows 10 1809: The release of KB5066586 bumps the build to 17763.7919 with standard fixes.
  • Windows 10 1607: Update KB5066836 increases the version to build 14393.8519 and addresses WinRM and fax modem driver issues.
  • Windows 10 1507: Update KB5063889 updates the build to 10240.21100 with security improvements.

Installing the Latest Update

To install this final update, navigate to your Windows Update settings. Activate the option that says “Get the latest updates as soon as they’re available” and then hit the “Check for Updates” button.

Update Release Timeline

  • Initial Release (Release Preview Channel):
    • Build 19045.6388, released on September 11, 2025.Official notes.
    • Build 19045.6390, released on September 16, 2025.(Same as.6388 notes.)
  • Stable Channel Final Release:

End of Support for Windows 10

As of today, Windows 10 has officially reached the end of its support lifecycle. From this point forward, Microsoft will discontinue all security updates, bug fixes, features, and technical support, leaving systems exposed to vulnerabilities and performance drops.

For continued use, Microsoft suggests upgrading to Windows 11 or exploring alternatives like Linux Mint. The Extended Security Updates (ESU) program is now available to regular consumers, initially designed for enterprises using legacy systems.

For a comprehensive list of unsupported versions, please visit this link. The versions include:

  • Version 1507 (RTM)
  • Windows 10 2015 LTSB
  • Version 1511
  • Version 1607
  • Windows 10 2016 LTSB
  • Version 1703
  • Version 1709
  • Version 1803
  • Version 1809
  • Windows 10 Enterprise LTSC 2019
  • Version 1903
  • Version 1909
  • Version 2004
  • Version 20H2
  • Version 21H1
  • Windows 10 IoT Enterprise LTSC 2021
  • Version 22H2

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Updated October 14, 2025: This article has been revised to include the latest information and ensure accuracy.

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