Hi,
I can help out here.
The latest version of WooCommerce Tickets is 3.12.1 so that is correct.
That version should still work with The Events Calendar 4.0
For 4.0 it was merged into Event Ticket Plus and you have a license for that plugin as well.
We have this guide to moving to Event Tickets Plus:
https://theeventscalendar.com/knowledgebase/moving-to-event-tickets-plus/
You should be fine to stay on WooCommerce Tickets for not, but would want to switch over to Tickets Plus in the coming months.
Let me know if you have any follow up questions.
Thanks