After having the same problem for the Linux driver, you have to click around multiple times. You're redirected to a page with both 'sign in' and registration information fields. You must both sign in and register the product. If you just fill out the product registration without being signed in, it appears to just fail silently. Once you sign in, you're still redirected to the same page. Fill out and submit the product registration. Once you get an e-mail informing you that you've registered the product, you're almost done. You can try reloading the same product page multiple times, or just click the link in the e-mail, and there you have it.
Really, really, awful customer experience. Hope the above works for you!
