https://support.apple.com/guide/mac-help/open-a-mac-app-from-an-unidentified-developer-mh40616/mac 

On Dec 30, 2019, at 2:30 AM, Michael Rueger <lists@andience.co.nz> wrote:

Happy Holidays!

Hope nobody is working ;-)

Just downloaded the Pharo launcher from the Pharo web site and get the attached error.

MacOS Catalina

Seems Apple has been busy inflicting more pain on developers?

Cheers

Michael

<Screen Shot 2019-12-30 at 11.28.27 PM.png>