Windows users can now perform a clean install of the upcoming Windows 10 2004 feature update before its officially released by using ISO disk images that can be downloaded from the Windows 10 Insider site. Users can use this ISO and a Windows 10 license to perform a. clean install before it’s released to try out new features and. determine if there are any issues with the build in your organization. Once installed, you will be able to continue to receive. cumulative updates until you link the installation to the Windows Insider program.
Source: https://www.bleepingcomputer.com/news/microsoft/how-to-clean-install-windows-10-2004-before-official-release/