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.
The Windows 10 October 2020 Update (20H2) in build 19042.631 came with the cumulative update 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 TechBench, Microsoft allows users to access ISO installation images of various company products. However, access to these downloads is quite difficult for regular users and 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 supported versions of Microsoft Office. Microsoft offers the Media Creation Tool for downloading ISO images of Windows 10 only.
Adguard.net has everything you need for ISO and will be downloaded through Microsoft Techbench servers.
Visit the Adguard page, select the language (icon on the top right) and then you can select the product (Windows, Office), the product version (Windows 7, Windows 8.1, Windows 10), the version, the language and the architecture (32 or 64 bit ).