Good evening Albert and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
I would definitely recommend trying things out in a staging / test environment if possible since this is such a big upgrade.
That being said, it should be smooth sailing for the most part.
The only thing that you will need to pay attention to is the migration from WooTickets to Event Tickets Plus.
I highly recommend reading the following: https://theeventscalendar.com/knowledgebase/moving-to-event-tickets-plus/
Let me know how that goes.
Best regards,
Geoff B.