The download will start immediately after you confirm your subscription.
You’ve just been sent an email that contains a confirm link. See the screenshot below.
Check your email and click on the link in that email. You will not be redirected to the download page until you click that link to confirm your subscription.
If you don’t see that email in your inbox shortly, fill out the form again to have another copy of it sent to you. Alternatively, you might want to try using another email address.