Click Confirm , then Download .

If you are on a Mac or Linux system, Microsoft's site will offer a direct ISO download. If you are on Windows, you can "trick" the site by changing your browser's user agent to appear as a different operating system. Windows 10 system requirements - Microsoft Support

Select Create installation media (USB flash drive, DVD, or ISO file) and click Next.

Microsoft tries to push users toward the "Media Creation Tool" rather than giving a direct ISO link. However, if you want the actual ISO file (to burn to a DVD or use with software like Rufus), here is how to get it:

Run the MediaCreationTool.exe file.