The application can't be opened:
1. Copy the S4MPLauncher to your Applications folder
2. Run the following command from Terminal from your Home folder: chmod +x /Applications/S4MPLauncher.app/Contents/MacOS/S4MPLauncher
3. Run the S4MPLauncher from the Applications folder
4. Go to System Preferences -> Security & Privacy and click on Open Anyway (and Open on every following prompt)