Build 19045.6388 (KB5066198) for Windows 10 drops as the October 2025 update (preview)

Windows 10 22H2 is getting Build 19045.6388 (KB5066198) in the Release Preview Channel, released September 11, 2025, with a small set of general improvements focused on reliability, networking, File Explorer, and input/IME fixes.
There are no new major features in this release.

Windows 10 build 19045.6388 (KB5066198) is now rolling out as part of the October 2025 update in the Release Preview Channel for version 22H2. This is a small update that only addresses some general issues, and it 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. However, the company isn’t sharing details on the exact changes.

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 11 build, enroll your device in the Release Preview Channel through the “Windows Insider Program” settings, located in the “Update & Security” section. Once you enroll the computer in the program, you can download the 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 19045.6276 release date: September 11, 2025. Official notes.
Second Release – Optional Install (Stable Channel):
- Windows 10 22H2 build 19045.xxxx release date: TBD. 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.