Very easy but you haven't given enough info for me to tell you exactly how to do it with your setup.

What macOS are you running? Did you receive your files on a drive or were they download only?

Basically, the easiest way is to install BIAB on each of your Macs with the RealTracks on your external. There's a hierarchy to be followed so that BIAB can find those tracks but it's easy to set up. PGMusic has tutorials on how to do this.

The other way is to run BIAB from your external. There is still a file set that must be installed onto both of your Macs.

All of this can be set up in the BIAB Install Manager. You will need to tell it where to install what.

If these are new installations, any extras you purchased over the years will have to be downloaded and reinstalled. I use the BIAB Install Manager to manage installations from 2022 on but I've some extras from 2018–2021 that I install manually—these will be in your Account.


BIAB 2025 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5