You should be able to install in an other folder than X:\bb\ however, the overwhelming majority of users do use X:\bb\ (where X: is the selected drive letter on the computer), so using this approach just offers a chance for some consistency.

Mine is installed in E:\bb\ as shown:

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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