how do I get the latest version of itunes for windows 10

As explained in the support document you posted from, If you downloaded iTunes from the Microsoft Store you can check for updates through there too.

If you downloaded it from the Apple Website, you can use the Check for Updates option in the Help Menu.

If you have not downloaded it yet to your Windows computer, then you can get it from the Microsoft Store: https://apps.microsoft.com/store/detail/itunes/9PB2MZ1ZMB1S?hl=en-us&gl=us&cid=appledotcom&rtc=1