Good afternoon Paul and welcome back!
Thank you for reaching out to us and kudos for finding the fix before we could get back to you.
We are sorry about the fatal error you have experienced while updating our plugins.
I want to apologize for any inconvenience that this might have caused on your site.
As you know, since yesterday, we have released some patches for the Events Calendar and Event Tickets plugins.
We just released a patch to address the Events Calendar Pro issue specifically.
Best regards,
Geoff B.