Just got off an online chat where a Microsoft rep took remote control of my little Windows 10 tablet to resolve an update problem. He went to this website: https://tb.rg-adguard.net/public.php
and downloaded the ISO for the latest version 1803 to my tablet. 4.4 GB, it will take a while. Anyhow, I figured that Microsoft-endorsed website may help somebody here someday. There are 47 TB of various Microsoft ISOs there, Windows, Office, etc.
Especially Heater, since he's such a Windows fanboy now.
One version available is Windows 10 Home China. Reminded me of some old Guiness Record for Chinese being the slowest language to type since there are so many characters & keys. Must be a nightmare to code!