The ‘Unregistered’ message is normal for the free trial key version. This message is only removed by entering the full version key you are sent when you purchase the program. Sometimes, however, a registry error occurs when you enter the free trial key and the Enter Reg Key item in the Internet menu is greyed out so that you cannot enter your full version key.
If this happens please send them an eMail to Ashampoo support and they will help you solve the problem.