That's apple's way of forcing devs to pay for their Apple Developer Program, and they convince us to do it by blatantly lying to users who try to download software that isn't codesigned. I'm not joking. Apple is a deceitful turd of a company. Do as instructed here and it will run: https://derflounder.wordpress.com/2012/11/20/clearing-the-quarantine-extended-at...