After reading this thread I'm still stuck... after any steps described above attempting to register I still get told I'm not connected to wifi and need to connect before registering.
(all I'm really trying to do is get my card image etc to show up on the simulator, which I can't do for any game, including FlappyBird, but reading the threads for that suggested registering the simulator first, so that's two rabbit holes for today XD - edit: added link: Help using pdxinfo and card.png - #7 by Tengu )
Here's one scenario I've tried, just from going back to the documentation and trying to follow along... what I wind up with is a doom-loop of open simulators, none of which can be registered (screenshots taken from top-to-bottom):
Is there a definitive way to actually register the simulator on Windows? (hopefully one that 'sticks', but I'd settle for just one that lasts long enough to try seeing my or any app's card image for now)