The Windows Insider program of Microsoft no ISO images for the Fast Ring are released. There have been some exceptions, but usually ISO images are only released through the program's Slow Ring.
So Fast Ring registered Insiders have a problem, especially if they want to make a clean installation using the ISO of the new operating system.
Below we will talk about the UUP Dump, a tool that will help you obtain the ISOs from Fast Ring, immediately after their release by Microsoft.
According to the project's developer, abbod1406, UUP Dump is an automated command script for processing UIP (Unified Update Platform) of Windows 10. The script allows downloading and conversion of the upgrade files, in a usable format (ISO or WIM).
Let's see how you can use UUP Dump to create a Windows Insider Fast Ring ISO.
From address https://www.uupdump.ml/, select Fetch latest build:
Immediately select the architecture you want (x86, x64, arm64) and click Get Updates
Click on the name of the download you see above and on the following ones displays you will be able to choose the language and version (Home, Home N, Pro and Pro N)
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and version:
Selecting "All editions" will download the files needed to create a multi ISO.
The next screen will allow you to download the selected files.
Select “Download using aria2 and convert”
A ZIP file will be downloaded. Save the file, and unlock it by right-clicking on ZIP. Select Properties, then Unblock
Export the contents of the ZIP file by right-clicking and selecting Export All. If you notice an error while exporting the ZIP, do not pay attention, press skip to continue the export.
When the export is complete run the file aria2_download_windows.cmd:
Immediately after the UUP Dump will download the UUP files. When the download is complete, the files will be converted to ISO automatically.
You will find the ISO in the folder where you exported the ZIP file. That was it, enjoy your new ISO.