GateKeeper

Gatekeeper introduced in macOS Sierra

Automated Installation
-Unzip <Open Gatekeeper friendly.zip>
-Right Click - Open With - Terminal
-New Window Appears
Press Enter
Done
Note: if it shows no such file or dir and try again. Try manual operation

Manual Installation

Option I
For a certain application run in Terminal:
sudo xattr -rd com.apple.quarantine /Applications/LockedApp.app
Or
Open Terminal type - sudo xattr -rd com.apple.quarantine (Drag & Drop App into Terminal window)
Note: leave a space after the word quarantine then drag & drop

Option II
To disable checks globally run in Terminal:
sudo spctl --master-disable