Hi,
Thanks for the interest in our plugins. We do not have a trail for Pro, but we do have a 30 day refund policy so if it does not work out you could get your money back.
Pro does not include any ticketing features that is in the ticketing plugins, which are separate.
https://theeventscalendar.com/tickets/
Pro is not a bundle of other plugins it has its own features such as recurring events, additional fields, and more views:
https://theeventscalendar.com/product/wordpress-events-calendar-pro/
As for support help it could be a conflict so I would try our testing for conflicts guide to see if that finds the issue:
Testing Conflicts With Themes and Other Plugins
Please note even if you are a Pro we can help narrow down issues, but limited in supporting 3rd party coding issues including with themes.
Let me know if you have any follow up questions.
Thanks