Bootcamp Windows 10 - No image are available
When I used an old product Win 7 Pro product key thinking I could upgrade (iso was Win 10 single language) it stated no images available when I entered my old key.

When I skipped entering a product key, it brought up the iso image as expected.  

On the second computer, I downloaded the first english image from Microsoft and it accepted the pro key.  Very strange that the single language image meant home only (not pro).