Welcome to the forums.

It appears that you have installed BiaB in D:\bb\ which should be fine.

Some files such as VSTi's, plugins etc are normally stored in the system \Program Files\ folder so that appears to be normal also.

You have installed your Drums and RealTracks on your L: drive which is also fine.

All you need to do is to start BiaB, select Options > Preferences > RealDrums and set the location to your L:\bb\ drive and repeat for options > Preferences > RealTracks, 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.