It’s always recommended to use the manufacturers app for calibration. That app should be free. They might also have a paid app but you shouldn’t need that one.
DC rainmaker says “And technically, there are two apps here. The first is their Elite MyE-Training app, which you can do calibrations from within:
And then there’s the new Elite Upgrado app – which actually launched on the Elite Suito a bit over a month ago. This allows you to do firmware updates of the trainer (oddly something relatively new to Elite). Simply crack it open and let it search for nearby trainers:”