You can install Final Draft 13 on as many computers as you want. However, if you have the standard retail package, only two of these can be used at a given time and can be used only on computers owned and operated by you.
If you have more than two computers on which you'd like to run Final Draft, you can sign out of one computer and sign in on another. To sign out, simply open Final Draft, go to Help > Sign Out.
Once you've signed out of Final Draft on one computer, you can sign into Final Draft on another computer immediately by using the email and password you created at the time of purchase. Note that your computers must be connected to the internet in order to sign in and out.
If you want to purchase more copies to use on more than two machines concurrently, please contact sales:
https://www.finaldraft.com/contact/contact-sales
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