You install Final Draft by downloading an installer file onto your computer, then running that file and following the steps provided. These installer files are separated by version of Final Draft and what type of computer you're using.
You can find installers for Final Draft 11, 12 and 13 via the link below:
https://www.finaldraft.com/support/manuals-and-software/
Final Draft 11, 12 and 13 can only be installed on a compatible Mac or Windows computer.
Final Draft Cloud does not need to be downloaded or installed, but instead can be accessed on any compatible device by visiting https://cloud.finaldraft.com/ .
Final Draft Go, our iOS app, can only be downloaded and installed via the iOS App Store on your compatible iPhone or iPad.