To deactivate Final Draft 8:
Open the program and go to Help > Deactivate. If you have an internet connection, choose Online Deactivation. The program will connect to our system and the activation will be taken off the computer and placed back into your account on our server. You can use this same activation for another computer or for this one if you're planning to, for example, reformat the hard drive or upgrade your operating system.
See this article if the activated computer doesn't have an internet connection: How do I manually deactivate Final Draft 8?
IMPORTANT: Live technical support (phone, chat, email) for Final Draft 8 will end on December 31, 2017. You will still be able to find information and solutions in this knowledge base, in the online troubleshooter and in the FD8 User Guide.