Huh, strange. I actually have Dramatica Story Expert installed on a MacBook Air as well (10.12), and it has worked fine for me (both the trial and the purchased versions). Does the software not start at all when you try to open it, or does it crash when you try to use a certain feature of the software? Or has the trial run out before 30 days are up? Does the computer display any error messages? Also, it may be helpful to know which version of Mac you are using (El Capitan, Sierra, High Sierra, Mojave, Catalina, etc).