I did. But my laptop (and back-up drive) with four yrs worth of sc4 work and a 3gb plugins folder were destroyed in 11/14. And I don't remember the name of the app. It does exist and was quite helpful.
I read somewhere that there's an SC4 app that can tell you what dependencies are needed when you open a city that pops up the "Plug-in Pack needed" window. Can anyone give me any information on such an app?