Pro sites error page

Hello guys, I have installed and network activate the plugin PRO Site.
I have followed your very useful installation guide and instructions found on the plugin web page. I have gone through all settings with the exception of Manage Sites ( Network Admin > Pro Site > Manage sites) However, the plugin does not show the pricing table. When I load the page mysite.com/pro-site the pricing table does not show: I can only see an hyperlink http://www.mysite.com, which if clicked it opens the pricing table in a new page.

Could you please advise or share resources (eg: tutorials) to resolve the problem??

Site is under construction so it not available, I am afraid.
Thank you for your support.