Good afternoon Brian and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the error message you are receiving.
I would love to help you with this topic.
Based on our files, it looks like your the Events Calendar Pro license expired in 2016-10-06.
It should still be downloadable and work fine, as long as you use the Events Calendar 4.3.4 found here: https://wordpress.org/plugins/the-events-calendar/advanced/
If that does not work, could you expand on the error message you are receiving ?
Best regards,
Geoff B.