I have purchased and installed the Premium version, and the issue with the error is resolved and the redirect to the thank you page works perfectly.
However, the formatting for the form that is displayed is a bit wonky. You can see the form here:
I am not using the PayPal or Authorize.net functionality, and am currently not using MailChimp (but will probably do so). Can this display be worked on somewhere? Is there a CSS file that can be fixed?
Let me know,