https://wccftech.com/windows-10-update-kb5001391-is-out-for-v20h2-and-v21h1/

Image: Drew Angerer / AFP / GETTY Images

Microsoft has released Windows 10 20H2 Build 19042.962 (KB5001391) to Insiders in the Release Preview Channel running the October 2020 Update on their devices. Windows 10 21H1 Build 19043.962 (KB5001391) is available for Insiders in the Beta Channel who are testing the upcoming version of the operating system - version 20H2 and 21H1 share a common core operating system, which is why they receive a similar set of updates.