Build 19045.6390: Windows Insider Release Preview Channel, September 2025. Fixes for update issues and general improvements

Addresses some issues with the update itself. The Release Preview update also includes general improvements and fixes for Windows 10 22H2.

Does it affect you? Applies to: Insiders in the Release Preview Channel who use Windows 10, version 22H2.

Microsoft publishes separate notes for this KB for Windows 10.

This is a test build for people in the Windows Insider Program. Features in it can change, be removed, or never reach regular Windows releases.

What changes

For: Insiders in the Release Preview Channel

For: Insiders using Windows 10, version 22H2

A small set of general improvements and fixes improves the overall experience for Windows 10 and its devices.²

Data sheet · Security · Downloads · Components Click to collapse or expand

Version	Build	Channel
—	19045.6390	Release Preview Channel

No vulnerabilities are listed for this update.

Updated Oct 27, 2026

Cited passages from Microsoft's official notes (2)

1. We are releasing Build 19045.6390 (KB5066198) today which is a small update that addresses some issues with the update itself. blogs.windows.com
2. This update includes a small set of general improvements and fixes that improve the overall experience for customers and their devices on Windows 10. blogs.windows.com

Checked automatically: 8 of 8 checks passed, 2 quoted passages

A second AI read the text against the sources: correctness 4/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake