Sometimes, your activations are limited, regardless if you buy the full version or the premium version for an application, but if it says that the activations expired, then only the developers can fix this issue since they are the only ones who can check your license status.
Firstly, reinstall the software using the following link and activate it: http://www.cyberedinc.com/
If it's not working, get in touch with support to receive additional details: http://www.cyberedinc.com/contact.html