Pro-Site plans only show after signup?

Hi,

When choosing a ProSite plan, if I go to domain.com/pro-site/ this is the message I get:

"You must first login before you can choose a site to upgrade"

Thus, it doesn't show any of the plans available, but it does when they sign up.

Is it possible to make the user view and choose a Pro-Site plan first, then register?

Thanks.