More on screenplay writing software (first a thank you once again to rcentros for his recommendations). In 1998, Stephen King published Storm of the Century as a screenplay rather than a novel. In the Forward to the book, he notes that it was written with the assistance of Final Draft. Because the book was written so long ago I checked to see if that software was still around - it is, Version 12. Here's the link, if interested:
https://www.finaldraft.com/learn/fin...art-guide-fd12