Hey Ashley,
Thank you for reaching out to us! I’m very sorry about this issue you are experiencing.
Based on the errors you just shared with us, your plugin files were removed/renamed via FTP, and/or the file permissions were changed and WordPress is not recognizing them anymore/ not allowing you to edit them.
I would suggest you to access your server via FTP, head over to wp-content/plugins/ rename the existing “the-events-calendar” directory to something else (you can also move this directory to another place or simply delete it, it’s up to you!), and download the latest version of the plugin from WordPress.org again.
Let me know if you need anything else in the mean time and I’ll be happy to assist!
Regards,
Patricia