How do I renew my YouTrack subscription and get updates and support again?

Your renewal options depend on your current subscription status. 

If you renew your subscription before the expiration date or within 1 year after it, each new year in your subscription will be available at 50% off the new license price. The new license period will be extended by 1 year from the expiration date of your subscription.

If 1 year has passed since your subscription expired, your only option is to get a new license.