https://wccftech.com/direct-download-windows-10-iso-files-for-version-21h1-32-bit-64-bit/

Windows 10 May 2021 Update is live! After several months of Insider testing, the May 2021 Update, version 21H1, is going live for the public. Like the previous versions, this would be a phased-out rollout, meaning not everyone would get it at the same time. However, through the ISO files, you can force and clean install Windows 10 version 21H1 on your devices without waiting for the official availability.

Microsoft has released the Windows 10 21H1 ISO files, which are now available for download. Here are the links (valid for both Home and Pro) to download Windows 10 May 2021 Update: