Although I use Macbooks, I'm afraid I've never tried to use the pscan on one, so I can offer no real help.
I use a couple of 2nd hand shitty old windows 10 laptopsfitted with solidstate hard drives for automotive diagnostics as they are compact and utterly disposable should they get overcome by gravity and percussion or get oil and grease all over them.
Kill one and rip out the hard drive, for use on the replacement and bin the rest......... much better than buggering up a nice pricey Macbook!
"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"