Okay, seems this topic still is going. So now just my few lines on that:
I also had exactly this error two years ago, buy installing the 4.1 version on an old P50 laptop. I couldn’t understand, why it didn’t show me the “correct” screen to choose templates, make one of them “the default” and ticking on checkboxes to define sys-qubes and if they should have disposable templates…
Reason simply was: A faulty .iso file I’ve downloaded from the Qubes-OS servers - or let me write this correct: The file possibly was good, but the download destroyed somethings… can’t explain.
Solution was in the end to download the .iso on a diferent device and also burn it elsewhere…
Here some screenshots, what Query probably see: