Here is how you will be able to upgrade from Windows 10 in S Mode for free via the Microsoft Store.
Recent S Mode Stories
Windows 10 S isn't just unusable. Apparently, it's not very secure either.
Microsoft confirms it's replacing Windows 10 S with new S Mode for almost all Windows 10 SKUs. Coming next year.
It's official, Microsoft is killing off Windows 10 S and is bringing S mode to all iterations of Windows 10 for the consumer and some enterprise SKUs as well.