As for when it will be possible to get S mode on the various Windows 10 editions, the "next update" of Windows 10 arrival date, as mentioned by Belfiore, is ambiguous, since Windows 10 gets updates every month.
We haven't quite reached March's Patch Tuesday yet, but Microsoft is shipping a small cumulative update for PCs on the Windows 10 Creators Update (via Neowin). The news may have been confusing to many, which is why the company has given a more detailed explanation.
Based on that feedback, we are simplifying the experience for our customers. Microsoft has certified that they are giving up Windows 10 S as an independent iteration of its platform and will instead offer an "S Mode" in already-existing versions, starting next year.
It's unclear for now what such a change might mean for people who bought devices built on Windows 10 S, which has since also been targeted at "first-line" employees who deal directly with customers.
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Microsoft's Windows 10 S FAQ has explained that switching from Windows 10 S to Windows 10 Pro is a one-way switch. For more, you can check out Microsoft's full release notes. It can't be undone, and presumably that could be true for other Windows 10 editions.
So, if you want to download and install install KB4092077, simply go to Settings Update & Security Windows Update and click on the Check updates' button.