To resolve Gatekeeper issues on macOS Sierra and unlock images and programs ( annoying image/application is damaged messages pretending you cannot open things ).
For that reason you might have to completely disable Gatekeeper checks, and to do that open your terminal and type:
sudo spctl –master-disable
Your mac password will be required.
For Mac OS X 10.11 or later read this
damaged app message
Most of new to Mac users don’t know about this and always ask what to do, the message above or the damaged app message appears when your are trying to install App or Game from outside the AppStore.
Any way to solve this follow these instructions :
1- Open your System Preferences.
2- Click on Security & Privacy.
3- Then on the General tab “Click on the lock to make changes”
4- Then under the “Allow applications downloaded from:” >>>> Click on “Anywhere”
You can now download any App or Game from Haxmac.me and run it without any problem.