Hi Alexandra,
Thanks for reaching out and sorry for the trouble updating!
I think it would be a good idea to try reinstalling Events Calendar PRO 4.0, which is available to download by logging into this site and heading to My Account > Downloads.
If you want, we can confirm that checking your system information. You can grab that on the Events > Settings > Help screen, then copy and paste it here as a private reply. That will help me see what is currently installed and make a recommendation from there, if you’d prefer.
Let’s start there and see what we find. 🙂
Thanks!
Geoff