Hey Gareth!
Thanks for your interest in both plugins; to address your first question, both licenses are $89 separately. In other words, buying Events Calendar Pro does not grant access to Event Tickets Plus, nor vice versa – however, just to be clear, you do not need Events Calendar Pro to use Event Tickets Plus.
As for a trial license, the nature of plugins makes trials really hard to do (because you have to take the software, install it on your own site, et cetera…)
The closest thing we have to this is just our 100% no-questions-asked refund policy. So if you buy a license, you have 30 days where you can play around with it, and as long as you ask for a refund within 30 days of purchase, we can issue the refund in full immediately 🙂 And so many people use this like a “trial”.
I hope the information here helps!
Cheers,
George