Noel,
Thanks for your reply. Investigating a little further, The set 265 appeared in a yellow message when I picked the style Smokers Serenade, however, the RT itself (2779 flute) is part of set 279, and set 279 was included with my BBW 2017 purchase. There are actually 3 other RTs marked as N/A in set 279 in Style/RT Picker. But, theoretically I should have all RTs in set 279. All in all, when filtering RTs to "Show only styles with RealTracks/RealDrums Not Found, 150 N/A are listed. But looking at my more recent purchase back through BB 2016 (I started with version 2004), I should have those RTs that are listed as N/A. Also, windows explorer lists bb/Styles=7629.Other items missing include those related to Amplitude.
W/E also lists the following for the RealTracks folder:

98.6 GB (105,897,747,965 bytes)
111,914 Files, 2,925 Folders

I haven't updated any amplitude sw since 2015, as the authorization was such a pain.

Perhaps I need to send PG an email/support request.

Thanks again Noel.