If you get an error message while installing the Amyuni PDF driver, press Control+Alt+Delete on your keyboard to bring up the Task Manager. Click the Processes tab and end the following processes:
You'll receive a warning when ending each of these processes but doing so will do no harm to your computer and the processes will start again when you reboot. Once these processes are closed, close the Task Manager window and reopen it to make sure that these items are not back on the list.
Try installing the Amyuni PDF driver again per the steps HERE and it should work.
NOTE: Live support for Final Draft 7 has been discontinued. You will still be able to install, activate and use FD7 on appropriate computers but email, chat and telephone support is no longer available. Live activation assistance will be available via phone (818-789-6281) and email and chat (links on the left side of this page) until June 14, 2017.