Hello Robert,
Thank you for reaching out with your question! Let me try to help you sort this out.
We do still offer discounts on license renewals. Before your license runs out you should get an email reminding you of the license period and a link to renew your license.
Or alternatively, a short time before your license runs out log in to your account here, go to your license keys and click on the renew button / link, which should also give you the renewal discount.
You can continue using the plugins without renewing your license keys, however, I would like to point out that without a valid license key 1) you will not receive any updates any more for your plugin (we regularly publish maintenance and feature releases that fix bugs and introduce new features); 2) you will not be eligible for premium support here in the support forums in case you run into any issues.
I hope this clarifies. Please, let me know if you have any further questions.
Cheers,
Andras