There's likely an easier way but here's how I list my RealTracks (2018 Build 520).
- In the "regular" BIAB display, in the Mixer window, right click on the blank space next to any instruments' "M S *" buttons (i.e. below the sliders)
- From the dropdown list, choose RealTracks
- The window that opens is "Assign RealTracks to Track"
- In the bottom left corner, enable all 3 check boxes
- In the row at the top of the columns, ensure you can see the one marked "Set"
- Make that column wider if necessary, then click on "Set" to sort the rows by set number
- When I scroll through the list, it starts at 1 and includes set 300
- At the bottom of that column are some Video sets on mine
- Now check the column to the immediate left of the Set column, called N/A
- That column shows (from the Help file):

" The "N/A" column shows "N/A" for RealTracks that you have not installed yet or haven’t purchased, if "Show RealTracks that are N/A" is checked."

You can sort by that N/A column to see if you are missing any RealTracks.
Good luck!
LLOYD S