As I understand it, the file structure of BIAB was substantially reorganized with version 2018, at the same time the new GUI option became available. There is a Cleanup utility in the menu system that will take an older installation and change everything to the current file organization.

I would think you should use only BIAB 2021 and install a minimal version of each computer. Copy only the RealTracks and RealDrums to the external USB drive. Add any older RealTracks from 2017 that aren't already there. Any copy utility won'ty overwrite a newer file.


BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Presonus Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.