I've downloaded the plugin again making sure it's the right version for the Mac, then dragged it into the HXT folder, after selecting a patch to split and going to the wizards menu, I get the list, but the splitpatch option doesn't appear, there are two empty slots in the list, as if there should be something there.
As far as using it with AMv16, I tried using that version, but kept getting a missing plugins window that kept going through all the plugins imaginable,so I gave up!