Microsoft allows you to download the latest Windows 10 ISOs from their site, but only if you are using a non-Windows browser user agent. This article will explain how to change your user agent in Chrome and Edge so you can download an ISO instead of using the Windows 10 Media Creation Tool. All you need is a web browser like Chrome or Edge and little knowledge of web developer tools. The above instructions are also valid for Chromium-based Microsoft Edge. You can download and save the ISO files from a Windows 10 device.
Source: https://www.bleepingcomputer.com/news/microsoft/how-to-download-a-windows-10-iso-by-impersonating-other-devices/