JohnJohnJohn is correct. Some of the paks will have had corrections / additions / bug fixes etc over the years. Installing everything over the top of your existing installation will do two things:
1: Give you all of the latest purchased paks.
2: Upgrade any existing paks that might have been amended since they were first installed.


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