Hi
At the moment, we don't have discount for renewal. We keep price of our extensions low already (compare to the quantity of the products and the support you get while using our products)
To be more clear, you don't really have to renew every 12 months. You only have to renew if you want to use latest version of the extensions or need support. If you don't need support and new features of new versions, you can keep using the version you are having
Regards,
Tuan