My purchase was as a download.

First, I re-downloaded and re-installed all of the RTs included with 2024. That didn't work.
Second, I re-downloaded and installed a full version (~159GB). That didn't work either. I completely deleted my 2022 version before doing a full install of 2024.

As an aside, I also have a bunch missing that are associated with Set #800. I think those are from additional purchases which I didn't make but are included ( or not) in styles that I have.

Using the Realtracks picker dialog only one shows up as N/A and that's 4679 Guitar, Electric, Soloist ModcountryTravellerJohnny sw16 075. If I do the 'Rebuild and Fix' button it tells me that there is nothing to do and that all of the realtracks are there. Clearly not. The four styles that I indicated in my first post are also missing RTs and do not play anything in those slots.

All very confusing for an old F*** like meself.