This means Insiders currently on Windows 10, version 21H1 (or lower) in the Release Preview Channel will need to go to Settings > Update & Security > Windows Update and choose to download and install Windows 10, version 21H2.
We are now offering the Windows 10 November 2021 Update to all Windows Insiders in the Release Preview Channel on Windows 10 via our “seeker” experience in Windows Update. Windows 10, version 21H2 offered as an optional update in Windows Update. We will continue to improve the overall experience of the November 2021 Update on customers’ PCs through our usual servicing cadence. We believe that Build 19044.1288 is the final build for the November 2021 Update, and the ISO for this build can be downloaded here. We are preparing the Windows 10 November 2021 Update (Windows 10, version 21H2) for release.
