I had to do exactly this for a family friend in his 70s, it was a fucking nightmare. I think ultimately I caved and hotspotted it to my phone just long enough for it to be happy, and disconnected it while it was still loading the sign up page so it fell back to local account creation (at the time I didn’t know about a@a or bypassnro)
The fact that we need a third party program to make our computer respect our privacy should say it all for Windows.