Build 19045.6396 (KB5066198) for Windows 10 drops as the October 2025 update (preview)

Microsoft rolls out the October 2025 Patch Tuesday update for Windows 10 22H2 with a small batch of fixes.

Windows 10 KB5066198
Windows 10 KB5066198 / Image: Mauro Huculak
  • Windows 10 22H2 is getting Build 19045.6396 (KB5066198) in the Stable Channel, released September 25, 2025, with a small set of general improvements and fixes.
  • There are no new major features in this release, as the operating system support is set to end in October.

UPDATED 9/25/2025: Windows 10 build 19045.6396 (KB5066198) is now rolling out as part of the October 2025 update in the Stable Channel for version 22H2 as an optional install. This is a tiny update that addresses some general issues, but doesn’t include any noticeable changes or new features.

The same update will eventually be available for version 21H2, but this will happen in the coming days.

According to the official notes, build 19045.6332 for Windows 10 introduces a small set of general improvements and fixes that improve the overall experience for customers. 

The company is also pushing a couple of fixes, including:

  • SMBv1 connectivity: Resolved a bug introduced in KB5065429 that blocked access to shared files and folders when using SMBv1 over NetBIOS (NetBT).
  • Autopilot ESP loading issue: Fixed a problem where the Enrollment Status Page (ESP) failed to appear during Out-of-Box Experience (OOBE) when deploying Windows 10 22H2 through Autopilot.

Microsoft does not reveal the final name of updates intended for the Stable Channel during the early development stages. While in preview, these are labeled as non-security updates. The official name, such as the October 2025 Security Update, is only assigned once the update is released on Patch Tuesday.

Windows 10 October 2025 Patch Tuesday – Manual installation process

To download and install this Windows 10 build, from the “Windows Update” settings by turning on the “Get the latest updates as soon as they’re available” option and clicking the “Check for Updates” button.

Windows 10 October 2025 Patch Tuesday – Update history

  • Initial Release – Release Preview Channel: 
    • Windows 10 22H2 build 19045.6388 release date: September 11, 2025. Official notes.
    • Windows 10 22H2 build 19045.6390 release date: September 16, 2025. (Same as .6388 notes.)
  • Second Release – Optional Install (Stable Channel):
    • Windows 10 22H2 build 19045.6396 release date: September 25, 2025. Official notes.
  • Final Release – Patch Tuesday (Stable Channel):
    • Windows 10 22H2 build 19045.xxxx release date: TBD. Official notes.

Windows 10 end of support

Microsoft announced the end of support for Windows 10 on October 14, 2025, even though they are still releasing maintenance updates. After this date, Microsoft will no longer provide security updates, bug fixes, features, or technical support for Windows 10. This lack of updates will leave your system vulnerable to security threats and may decrease its performance.

Since the software giant will no longer provide updates or support for Windows 10, you should upgrade to Windows 11 or another operating system, such as Linux Mint, or plan to purchase a new device.

If you want to continue using Windows 10, Microsoft now offers Extended Security Updates (ESU). This service was originally reserved for organizations needing to run older operating systems beyond the official support period, but it is now also offered to regular consumers.

Update September 25, 2025: This content has been updated with new information, and it’s been revised to ensure accuracy.

About the author

Mauro Huculak is a Windows How-To Expert and founder of Pureinfotech in 2010. With over 22 years as a technology writer and IT Specialist, Mauro specializes in Windows, software, and cross-platform systems such as Linux, Android, and macOS.

Certifications: Microsoft Certified Solutions Associate (MCSA), Cisco Certified Network Professional (CCNP), VMware Certified Professional (VCP), and CompTIA A+ and Network+.

Mauro is a recognized Microsoft MVP and has also been a long-time contributor to Windows Central.

You can follow him on YouTube, Threads, BlueSky, X (Twitter), LinkedIn and About.me. Email him at [email protected].