We have checked your account and found out that on 04/24/2018 you have purchased SQLBackupAndFTP Lite version 11 without the Full-service subscription and then on 04/24/2018 upgraded it to Standard without the Full-service subscription. It means that you have had only one month of the Full-Service subscription which expired on 05/24/2018. You can find more details at your “My Account” https://sqlbackupandftp.com/account page.
Your license never expires and you can use the version you’ve purchased forever. However zero-config email service for sending backup notifications, support, auto-update, SQL Server down alerts, and weblog are parts of the optional Full-Service subscription and requires a yearly recurring fee.
Please find more details about Full-Service subscription at https://sqlbackupandftp.com/blog/full-service-subscription
If you have any further questions, please feel free to contact us.