Welcome to the dCS community, Doug, and congrats with your new Bartók.
You are right, the new dCS website in some respects is a mess, and not functioning. The old site’s links have not been redirected to the new ones, mentionned in the manuals. And the search function on the new site is also not working properly. As you said, once you find the Windows USB Driver on the new site, it does not download.
It does show up in the search results, however:
https://dcsaudio.com/search/results?q=usb+windows+driver
It does not work in Firefox, Edge and Chrome.
You could ask @aman about further help, he is the digital content manager of dCS.