Microsoft released the Windows 10 20H2 (October 2020 Update) ISO build 19042.631 through Techbench. Here is some information on this and how to get the ISO.
Windows 10 October 2020 Update (20H2) in build 19042.631 came with the cumulative information KB4594440. This is an out-of-zone update for Windows 10 version 2004 and version 20H2, which is intended to resolve the authentication problem Kerberos.
What is Techbench?
With the program TechBench, Microsoft allows users to access ISO installation images of various company products. However, accessing these downloads is quite difficult for regular users and the download links via Techbench expire after 24 hours.
But there are many who need to download an ISO for Windows 7, 8.1 and Windows 10 or an ISO for its supported versions Microsoft Office. Microsoft offers the Media Creation Tool to download Windows 10 ISO images only.
Adguard.net has everything you need for ISO and will be downloaded through Microsoft Techbench servers.
Visit the Adguard page, select the language (top right icon) and then you can select the product (Windows, Office), the product version (Windows 7, Windows 8.1, Windows 10), version, language and architecture (32 or 64 bit).
Just download Windows-ISO-Downloader and download any version you want.
https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-and-office-iso-download-tool