Hi,
Sorry for the issues you are having. I can help troubleshoot this with you.
Many times the issue is saving before a valid message is shown, so the key saves, but it is not saving that it is valid.
Can you please confirm you are following all these steps:
Visit License Tab
Enter License Key
You get a Green License Valid Message
After you get the message you are then clicking “Save Changes”
Then you get a “License key(s) updated.” message near the top of the page.
Also you can can always download the latest version from your account here on theeventscalendar.com and use this guide for manual updates:
Manual Updates
Let me know if it is not working after following those steps and we can do some troubleshooting steps next.
Thanks