From the developer's website:

You have a story to tell. Use Final Draft to write it.

Use your creative energy to focus on the content; let Final Draft take care of the style. Final Draft is the number-one selling application specifically designed for writing movie scripts, television episodics, and stageplays. It combines powerful word processing with professional script formatting in one self-contained, easy-to-use package. There is no need to learn about script formatting rules – Final Draft automatically paginates and formats your script to industry standards as you write.

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1. Open the .dmg

2. Use a program like Crossover (http://piratebayproxy.live/torrent/4971142/CrossOver_8_Pro) to open the Windows-based keygen.

3. Generate a customer number with the keygen, install the program.

4. When the program gives you a Challenge Code, put it into the keygen and hit 'generate'. 

5. Put the generated Response Code back into the program.

That's it! Happy screenwriting!