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 & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.