Just an Apple nasty trick to fight open-source development. As the download page indicates : Launch from Applications or Spotlight https://veganostr.com/#install If it still refuses, then open the terminal and type : sudo xattr -cr /Applications/Vega.app Either should put the app out of quarantine...

That’s odd. You do use a silicon Mac (Mx proc), right ? You may also want to try, in the terminal : sudo xattr -rd com.apple.quarantine /Vega.app It’s definitely the mac, not the app, I’m writing this using it ;-)