Hi Heather!
I’m sorry to hear that you are having issues with your license. I will try to help you get this sorted.
I checked it out, and your license is valid, and it does not yet have a site associated with it. Things to check:
1) You are copying the license key that is shown when you log in to your theeventscalendar.com account.
2) You are pasting it in the correct place. In Events > Settings > Licenses tab, make sure to add the license key to the “Events Calendar PRO” license field, and not the field for Aggregator or any other plugins.
If you are doing these things, can you please take a screenshot of the field with your license key in it and the “not valid” message visible, and upload it here in a private reply?
Thanks!
Sky