Hi Paul,
I’m sorry to hear you’re running into this issue, but I’ll be happy to help you get it figured out! First, can you please send me a screenshot of Events Calendar Pro on the Plugins page of your WordPress Dashboard? It’s not showing up in your system information, and it’s possible it was deactivated during the update.
If you can verify that Pro is active, the next step would be to try testing for conflicts with your theme and other plugins. It could be that the most recent version is conflicting with something else on your site. If you don’t have a testing site already, WP Staging will let you create a quick copy of your live site that you can use for testing.
Let me know what you find!
Thanks,
Jennifer