https://wccftech.com/how-to/how-to-download-older-windows-10-versions-iso-files/

As soon as a new Windows 10 feature update drops for the public, Microsoft makes the previous version unavailable. This is obviously done to make sure users upgrade to the most latest version of the operating system that will also be supported the longest. However, there are times, more often than we like, when the current version just doesn't cut it. Whether it's because of any compatibility issue or stability problems, if you want to use an older version of Windows 10, the Windows maker doesn't support this downgrade, at least not openly.

However, it is after all Windows and not the Apple ecosystem, which means there are almost always ways to make things happen. Thanks to a simple bat file, you can now choose to install any of the older versions of Windows 10 and download it directly from Microsoft's servers.