Hi Toby,
I’m sorry you’re running into this issue! It could be that you are running an older version of Event Tickets Plus and a newer version of Event Tickets, which you can update without having a license. We made some major changes to ET and ET+ in the last release, so if you are running an older version of ET+, you may want to downgrade to the previous version of ET until you renew your license. This article has instructions on manually installing a different version.
If you need help getting back into your account, you can reach out to us by filling out the form on our Contact page and selecting “Help accessing my account”.
I hope that helps! If you need further help with this issue, we’ll be happy to help you over in our Event Tickets Plus premium support forum! Please note that you do need an active premium license in order to post in this forum.
Thanks,
Jennifer