Three things to try:

(1)In the Style Picker, perform a full rebuild

(2) Help > What AddOns Do I have, and check for unexpected missing Styles

(3) Log On to your PG Music account, re-download the items and reinstall over the existing system.

Quote:
...followed by dialogue boxes stating the the required Real Tracks are missing
Can you advise some of the Real Track names that are missing?

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BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones