Scaler 2 Trial Won't Start

Complete Newbie here.
I’ve downloaded the Scaler 2 trial version and have tried to use it in Garageband and Reaper with my Macbook.
Although it seems loaded, I’m unable to see the Scaler Interface. I do hear the ‘white sound’.
I click the ‘continue trial’ and I’m taken to the DAW, I see Scaler loaded, but can’t move beyond that.
I’m using a Macbook Air, Apple M2 in Sequoia 15.3
What am I doing wrong?
Thanks so much.
Stephen