Did you just run Screenwriter or Dramatica on MacOS 10.13.x High Sierra and get an alert: Dramatica Story Expert or Screenwriter "is not optimized for your Mac"?
Movie Magic Screenwriter and Dramatica Story Expert are presently 32-bit Carbon applications. Apple is planning to end support for all 32-bit applications, however that will not be until Apple releases the next major version of MacOS, version 10.14, in late September 2018.
FEAR NOT: We are working diligently so our software will be ready for that September 2018 date.
However, it is important to understand that you will not lose the ability to run Movie Magic Screenwriter or Dramatica Story Expert while your computer is using any version of MacOS High Sierra 10.13.x, no matter how many updates of High Sierra Apple pushes to users.
So there's nothing to worry about until you proactively choose to install the NEXT version of MacOS, version 10.14, which won't be available as fully tested software until at least last September.
Warning about public testing of pre-release versions of MacOS 10.14:
Beginning in late June and continuing through September, Apple will begin testing the next version of MacOS, version 10.14 (yet unnamed). DO NOT INSTALL PUBLIC BETA VERSIONS OF MACOS 10.14 or your installed copy of Movie Magic Screenwriter and Dramatica Story Expert will cease to function!
Users of Screenwriter on High Sierra should already have upgraded to Screenwriter 6.5, and be running the latest updated version, 18.104.22.168. Users of Dramatica Story Expert on High Sierra should also begin migrating to the free update to version 5.3. Run HELP > Check for Update on Screenwriter and DRAMATIC STORY EXPERT > Check for Update to see if you have the latest versions of our software.
We will keep you informed via email as to when it will be safe to install updated 64-bit versions of our software for MacOS 10.14.
NOTE that Apple's alert is only shown the first time you launch a 32-bit app on High Sierra 10.13.4 or greater.
What If I Continue to Use MacOS 10.13 High Sierra, or 10.12 Sierra, or 10.11 El Capitan, or 10.10 Yosemite?
So long as you continue to use MacOS 10.10 through 10.13, your 32-bit software will continue to work as it does now. You cannot be affected by the phasing out of 32-bit applications unless and until you upgrade your Mac to run MacOS 10.14, which won't be expected until the end of September.
Will there be other benefits to a 64-bit version of Movie Magic Screenwriter / Dramatica Story Expert?
Yes. All 64-bit applications are fully Retina enabled (higher resolution graphics), and are generally faster and capable of using more memory.