I also downloaded the new build and have the message "The application "HeadlinerNoviNews" can't be opened." There's no security permission it doesn't have (I checked) and it doesn't run from the terminal.
Miguel,
First, can you make sure you UNZIP the .zip file (which has the .app inside). Next can you try this: "It might be a problem with your security settings and using non-apple store apps. If you go to System Preferences > Security & Privacy > General and allow the app manually it should run. I'm still on High Sierra so not sure if this will work for a more recent OS."