Once you review a license, you can reset the URL yourself if you have not changed it in the last 6 months. If you've changed/set it in the last 6 months, a member of the staff will need to help you.
So you should just need to login to the Client Area, find the expired purchase, and click "Renew Now". Once it's renewed and active, click "Manage This Purchase" and then "Change Licensed URL".
🙂