Why does Ten Thumbs say that my registration code is invalid?
If you enter your Ten Thumbs registration code and you see the above dialog then you are most likely trying to unlock the single user edition of Ten Thumbs using a multi-user code or the other way around. You know you have a multi-user registration code if the code starts with three letters. A single user registration code contains only numbers.
If you have a single user registration code make sure you download the single user version from our website.
If you have a multi-user registration code make sure you download the multi-user version from our website.