Good afternoon and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the message you are getting.
I would love to help you with this topic.
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Secondly, it looks like your license is currently tied to adb.b0b.myftpupload.com
I am not sure if this is the desired domain you want, but if not, you might want to read the following: https://theeventscalendar.com/knowledgebase/moving-your-license-keys/
Have a great day!
Geoff B.