https://wccftech.com/download-windows-10-2004-iso-files/

Microsoft has today released the Windows 10 20H1 ISO files for clean installation. The files are out for Windows 10 version 2004 Preview Build 19041, which is the ready to manufacturing (RTM) build. The RTM build was released a couple of months back and continues to receive cumulative updates in the Slow ring.

While Microsoft had finalized the development of Windows 10 version 2004 back in December, it is yet to release it to the public. The Windows maker is likely to ship it on regular schedule, sometime in April or May.