So what if someone, not naming any names, gets a beta invite in their email with a username and password, but there is no beta download link at all? What is that supposed person supposed to do about it?

He should ask for a link in the beta forums

Which would be in the invite email.

If there's no link for there either, then it might not be a legit mail.

PM GStaff about it.

They contacthttp://help.elderscrollsonline.com/app/ask to check it out.