I’ve just repeated all your steps after the rigmarole of getting the NOX app stopping at 99% problem.
I think I found the website which you are referring to for downloading older versions of Blink Home Monitoring app (APKMirror).
Version 2.0.14 of the app launched into a blank narrow window, then closed without any action. I then downloaded version 3.0. Which again opened a narrow window which closed, then, like your experience, I got the “Unfortunately, Blink has stopped.” notification.
I’ve made an account with Blink on my mobile, the purchase of the cameras is delayed hoping for NOX on a laptop, the cameras are in my basket with Amazon ready and waiting to buy. I’d seen a member here showing his multiple camera setup using NOX, which I really liked
I’m on High Sierra 10.13.6. Has anyone found a version which actually works with NOX?