I try to open the game on Mac and the following message comes up: “KSP can’t be opened because it is from an unidentified developer” Jenn L. October 22, 2019 18:19 Updated Follow You will need to change your Gatekeeper settings on your Mac. You can follow the instructions here to attempt this. If you are still encountering issues, please submit a support ticket. Related articles I signed up for Ancestors: The Humankind Odyssey 3 years ago, but never got my key! Comments 0 comments Article is closed for comments.