Hi Sarah!
Thanks for getting in touch with us! Let me help you with this topic.
We have recently made some changes in our site that also modifies how upgrading a license work. You can learn more about it here > https://theeventscalendar.com/knowledgebase/upgrading-a-license/
In your case, your Event Tickets Plus license was purchased before these changes were made. This means that if you choose to upgrade your license, you will obtain a new license key, which will be valid from the day of purchase for 1 complete year.
I can see that your Event Tickets Plus license is very recent, so I can offer you a full refund for it and then you’ll be able to obtain a totally new higher tier license, if that is more convenient to you.
Let me know about it.
Thanks,
Victor