Hello Gregory and welcome to the forums!
Thanks for going Pro!
Since you already have the plugin, the steps are easy:
- upload the Pro plugin to your website
- activate Events Calendar Pro plugin beside The Events Calendar plugin (Pro will not function without the basic)
And you are all set.
As Events Calendar Pro is a extension of The Events Calendar, all your events and settings will be there, waiting for you. Nothing will be deleted or removed.
Let me know if this helps and if you have any other questions.
Cheers,
Andras