The official Windows ISO downloader, Media Creation Tool has several limitations from many opinions. You have to run it tool on Windows, log in with an administrator account and download only the latest official Windows 11 stable ISO image offered by Microsoft.
The TechBench website makes it all easier. It is running from a program tours, which means you can have access to Microsoft ISOs from any browser or operating system system. It does not require elevated user rights as it is a simple file download. Finally, it gives users access to more ISO images than Microsoft itself.
It currently has two ISO images for Windows 11, but there are also Windows 10. So you can download any final version of new Windows 11/10 features as an ISO.
But since we are talking about ease of downloading Windows ISO, we should also mention the tool Media Creation Tool.bat, an improved Media Creation Tool.
It has more shooting options and includes some other useful options, e.g. to bypass Windows 11 system requirements during installation.