Once your trial comes to an end you can either purchase a full licence or simply uninstall.
If you decide to purchase a licenced copy, you will be issued with a new serial number once the purchase has been completed. You will need to enter the new serial number into the Hound Tracker tool to re-enable all functionality. Open Hound Tracker and go to Help > Licence Manager.
Note: if you have purchased a full licenced version of Hound Tracker you do not need to uninstall the trial version. Simply replace the trial serial number with your new serial number and Hound Tracker will keep on running.