Is there an alternative to downloading a Windows ISO?

Episode 1530 (1:44:25)

Joseph from Florida
Windows 10

Joseph has the Windows 1809 update and he did a clean install when doing it. He's had no problems. He wants to know if he can get Windows from a third party with an HeiDoc ISO downloader. Leo says that's a bad idea. Microsoft offers its own ISO download through the Media Creation Tool. That's really the safest way to get it.