Yes, users who have purchased the Mac App Store version will later be able to purchase upgrades if they have registered. The online registration form is available in the program under Help > Register.
Please note that the Mac App Store is currently unable to sell upgrades for any software title. If the App Store is still unable to offer upgrades by the time the next version of Final Draft is released, those wishing to upgrade will have to do so through our sales office.
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https://fd.support/3P3qAbE