Yeah I just was trying to figure out this issue myself after getting all excited hearing about the Windows app. It does indeed seem to be currently only available for the new Note 10(+). That DeX site above is a bit confusing as its also promoting just the DeX feature in general. So yeah DeX mode does work on many Galaxy devices when connected properly to a monitor directly, which is what is noted at the bottom of that page. But specifically for use the new Windows/OSX app to connect via your PC you need to be using a new Note 10, as it states directly underneath that download link " *Only available on Galaxy Note10/Note10+, and requires PC app download". Really hoping they add this soon to Note 9 and I think they will as it would be really easy, just an update for the Note 9 is all that is needed. B ut probably not until much later this year as it makes for a good selling point for trading up to the Note 10 for to moment. All about that money.
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