I just bought this plugin just to have access to the custom registration forms. I created a registration form and put the shortcode in a page. When I access the page it starts loading but then stops. Only the header and title are shown.
Please check your site now. You have misconfigured the plugin settings from Payment section. You did not create any subscription page but you have select redirect to subscription page. So for that reason it was not showing. You have to create subscription pack page to redirect user to register from there.