I downloaded the mac build, but when I try to run it "The application 'FTB.app' can't be opened."
This happens sometimes when you make a mac build on a windows machine with Unity. Fellow macOS users, you can solve this by navigating to the FeedtheBeast folder you extracted and in your terminal run `sudo chmod -R +x FTB.app/Contents/MacOS`. Then you can run the app just fine.