Yes, metered connection setting is just for those cases so you don't get charged arm and a leg and can plan your updates to time when it's cheaper or when you have a larger leeway to download.
Did mine via that link
Downloaded and installed ok
All is Well now With Cortana, The Regedit did the trick. Cheers Folks!
Solved Cortana not showing correct language - Windows 10 Forums
The reg edit brings her back to life.