Each TeamCity Enterprise Server license comes with free upgrades to any new major TeamCity version released during the next 12 months.
To continue receiving upgrades after that period, you can purchase Enterprise Server Upgrade Subscription renewal for an additional year. Subscription renewals commence from the expiration of your previous subscription period, regardless of when the subscription renewal is purchased.
60 days prior to your first subscription expiration, we will send you an invoice for the subscription renewal. You may want to pay this invoice at that moment, in order to keep receiving uninterrupted software updates.