Simple Calendar for WordPress Broke

Hi there. The latest version of WordPress seemed to break Simple Calendar. I had to deactivate it so my web page would come up. We are running version 3.3.1, WordPress 6.5.4 and PHP version 7.4.33.

Do you have the previous version available that I can replace it with until I can finish the redesign of my website?

Or, do you have any suggestions on how to correct the error? Thank you

The page I need help with: [log in to see the link]