Good evening Aaron and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your question.
Do you need to purchase both Event Tickets and Event Tickets Plus in order to sell tickets? Or Can I just purchase Event Tickets Plus?
That is a great question. Event Tickets is actually free: https://wordpress.org/plugins/event-tickets/ and yes, you need to install it first.
That means that you’ll only need to purchase and install Event Tickets Plus to extend Event Tickets and be able to sell tickets.
Let me know if that helps.
Have a great day!
Geoff B.