Just for the record, (should anyone ever stumble upon this thread) the way to access the required files from GW-Instek's site is to jump through the hoops for their Member Registration, confirm the email they auto-send you & then login.... (as is the case with most manufacturers).
Bit of a brain-fart on my part not to have put 2 & 2 together, all happy with my new scope with latest FW plus the bode-plot App.