Many thanks for your answers. You were right. I was running 2.2.2 in Reaper but 2.2.3 in Solo. (I naively assumed that Reaper would automatically scan for updated files.)
Ok, I just downloaded the Slate presets. Very nice they are too. My problem is that I see them in Solo, under the “Combined Presets” menu, but I do not see them when I open Superior as a VST in Reaper.
So my question is: how do I get the presets in Reaper as well as in Solo?