See this article for information on Final Draft compatibility on various Mac operating systems: Which version of Final Draft can I run on which operating system?
NOTE: All support for Final Draft 9, including activation service, has been discontinued. Final Draft 9 can no longer be activated (or re-activated) to run in full mode on any computer. If it is currently activated, Final Draft 9 will continue to work but only on that computer and only if nothing is done to the computer that will deactivate it (such as an OS upgrade or a replacement hard drive). Live technical support (phone, chat, email) for Final Draft 9 with a Final Draft technician is no longer available.
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https://fd.support/3WTinIS