Final Draft will import the following file formats:
A script written in any standard word processing program can be exported as a text or RTF file, then imported into Final Draft. Final Draft will reformat the file as a feature screenplay. Exporting as text is the best choice, exporting as RTF is the second-best choice.
Open the script in the program in which it was written and save as or export it to your Desktop (or some other convenient place) as a plain text (ASCII) file. Then: