Moved. No worries
The terms of the subscription can be found in the link below (navigable by going to Extensions -> Subscription FAQ):
www.sourcecoast.com/extensions/subscription-faq
The quick answer is that you aren't required in any way to renew. You can still use the extension past the subscription expiration, you simply loose access to download the newest releases and we don't prioritize your support requests.
If you have any questions, just let us know. If you have a suggestion on how to make the FAQ link stand out more, or something what would have drawn your attention to what it contains better, we'd love your feedback.
Thanks!