Hey Rhonda,
Thanks for contacting us! I’m very sorry about this issue you are experiencing.
This article was written to help people to move their licenses to a different site, but I would like you to use it to disconnect/reconnect the license key from your account/site and check if the problem is solved after that.
Regarding the new themes, you can use The Events Calendar (TEC) with any theme you want: there is no restriction associated with your theme update and our plugin. If for some reason you find any incompatibility issue you can report to us and we will be happy to help you to find a solution!
If you have any custom code for TEC in your current theme’s directory (in functions.php file or in the tribe-events directory), I would suggest you to save a backup for these files so you can migrate them to the new theme in the future.
Let me know if you need anything else and I’ll be happy to assist!
Regards,
Patricia