As you may or may not know, Windows 10 (also 8.1, for that matter) considers mobile broadband as a metered connection. However, here in Finland they all are charged a fixed monthly price. That much for localization...
Today I had a case of installing a printer to a natively Win 10 HP laptop. The system had already found the printer but it lacked the drivers. So I made Windows search for them. After a while some progress was to be seen: The printer was recognized with a note that it lacks the drivers which can't be downloaded because of a metered connection. So far so good.
Opened the mobile settings, found the connection, clicked it - no button for metered connection. Searched the 'net, found the mobile operator's illustrated guide where the previous procedure was explained. Searched more, found Microsoft's guide which was similar without illustration. Searched more, same result everywhere.
Called Microsoft. The young tech led me through the same procedure again, no joy. No such button under WiFi either. The guy said he's using a virtual machine so there's no WiFi nor mobile available, LAN being non-metered by nature. Finally he advised me to call HP in case they somehow had porked the option.
Called HP. No, they couldn't help me. Finally during the call I found something that looked more like a workaround: There was a download measuring system which could be set to daily, weekly, monthly and unlimited. The last one was the correct solution. There was something else, too, which disappeared after unlimiting the downloads so I couldn't check it later but which seemed to affect somewhat similarly.
When I got home there was e-mail from the Microsoft tech referring to a thread about modifying the Registry to make any connection metered or non-metered:
http://answers.microsoft.com/en-us/windows/forum/windows_10-networking/how-to-set-an-ethernet-connection-as-metered-to/ecdaca08-d413-4a6a-9e33-b4afb337fc18?auth=1. That should help a little in controlling the updates...
The other case of today was another Win 10 HP laptop. The issue was that for some reason the localization had stopped working. Despite every instance in the Language and Region settings read Finnish only, all the menus were in English. The Language Pack settings checked Windows Update and found an update. However that failed a dozen times despite rebooting. Need I say that this laptop didn't have the metered button either? Finally I found a third party site that offered direct links to every Language Pack available (none could be found from Microsoft, at least not easily). After installing that with the appropriate Windows tool the login screen said Welcome and asked for Password in Finnish! Yay! Unfortunately that was all. In the Language settings it read that the Language pack had been installed, so apparently it was the right one.
Another call to Microsoft: Try System Restore. If that doesn't help, try something else... Well, there was only one restore point available and it was for today. No joy...
Plus a call from a bookkeeper who said her 10 is all goofed up. She later called that she had managed to sort it out herself: For some reason the computer had gone into Tablet mode which aside of other inconvenience kept flickering.