xattr -r -d com.apple.quarantine ~/Desktop/Mac\ Starter\ Pack

I think the crash-on-launch has to do with App Translocation, which is a security feature introduced recently in macOS. Essentially, when you download an app from the Internet, the system treats it with some suspicion. When you run the app out of ~/Downloads, it actually copies the PyLNP.app to a separate directory and runs it from there. Since it doesn't know to also copy the Dwarf Fortress directory (etc.), then when this isolated PyLNP.app tries to find it, it exits immediately.The workaround *should* be to move the whole folder out of ~/Downloads. Please tell me if that doesn't work for you. If it still doesn't work, you can open up the Terminal and run this (adjusting the path for wherever you moved it):Unfortunately, I think working around this is going to be a little tricky. I was thinking of just moving Dwarf Fortress etc. inside the PyLNP.app bundle, which solves the problem, but App Translocation still prevents the .app from writing inside its own bundle. So figuring out where to put saved games, etc. is a little tricky.