In the Style Picker, if you search for the string 'multistyles', do you see them in the list:

Also, presumably you purchased the Windows version (as this is the Macintosh forum page)?

Did you use the BIAB Installer or what method did you use to install them? I understand that they should be installed into the x:\bb\Styles\ folder.

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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