Having trouble locating/loading backbone in Garageband


New member here. I just downloaded the trial of backbone on my MacBook Air m1 and downloaded the Elicense and all that. I can’t seem to locate or find out how to load Backbone in GarageBand ? Is it possible to use backbone in garage band ? I checked the folders and all I found was a .component file and a .vst file. Isn’t there supposed to be a .au file for Audio unit for Mac?

Any help or guidance would be appreciated.