From the FAQ at the Slysoft site: How do I enter the license key?
[I]After you have installed the trial version execute the license file ('key.AnyDVD' or 'key.CloneCD') that you have received via email or from a download link. You software is unlocked with the next start.
Please make a safety backup of your license key file on a floppy disk or a CD and keep it in a safe place - we cannot replace your license key if you have lost it.[/I]
Double click on the key to enter it into the registry. Then restart the computer.