I have Trend Micro Premium Security. I am searching your site and see Trend Maximum security. What is the difference between Maximum and Premium security? The last time my subscription was renewed somehow I was upgraded to support 10 devices. I only need to support 5 devices.
The main difference of Trend Micro Maximum Security and Premium Security is the number of devices it can cover. Maximum Security can cover 5 and Premium Security can cover 10 devices. You can check this page: Trend Micro Security software feature comparison
The subscription you have ever since according to our end is the Premium Security that is why when you renew, you will still use the same subscription.
Hope this answers your query. Don't hesitate to post here if you have any other concern.