Downloading unsigned applications Using MacOS Sierra, I have downloaded an unsigned app from a website.  When I open it, my security settings prevent me from running the app (it is from an unknown developer), but I can open it from the Security panel in Systems Preferences.  All as expected.

However, if I put the same .zip file I downloaded onto a different server, and download it from there, when I try to run it, I get a different dialog about running applications downloaded from the internet, and if I say to open it anyway, it fails, presenting a dialog saying there was an error (but nothing about what kind of error), and the option to check the console (which does not present anything obviously useful).

Can anyone explain this behavior, and what (if anything) I can do to prevent these problems when downloading from this second server?
To get around that, all you need to do is Right Click and Open This will now allow you to open up unsigned or 3rd party apps. 

Its an automated safety feature within SIP (System Integrity Protection)