https://wccftech.com/windows-10-update-kb5003690-is-available-for-v21h1-and-v20h2-insiders/ > Image: Drew Angerer / AFP / GETTY Images > Microsoft has released Windows 10 21H1 Build 19043.1081 (KB5003690) to the Beta Channel and Release Preview Channels for Insiders who are currently testing the May 2021 Update. This "preview" update is also available for 20H2 Insiders in the Release Preview Channel who are getting Build 19042.1081 (KB5003690).