To renew an Add-in or Connector license nearing its expiry, simply purchase a new license code for that product and enter the code in the product’s License wizard. Your original expiry date will be extended by a year. That’s it!
For the Core Add-in, use the Check License wizard (License tab) on the ribbon bar. For any connectors, you will find it in the individual connector’s menu list or through the Manage Connectors wizard (click on the entry).