There are two ways for applications when it comes to licence deactivation:
Access the Help menu and look for Licence. If I am right, you should be able to deactivate it from that menu or look in the installation folder for a Licence Manager.
Make sure you are connected to the Internet, then uninstall the application and use the serial number to register the software on the new computer.
Note: Some licence keys can be used for a limited number of times. This means you should get in touch with the developers to ask them about this information, since they're the only ones who have access.