After a GPG to GPG suite update, the notification on installation pops up subsequently on restart. Solution: Remove the MacGPG2 folder: sudo rm -rf /usr/local/MacGPG2 folder Re-install GPG Suite.

Fix the “App can’t be opened because it is from an unidentified developer” Error in Mac OS X

To temporarily get around “App Can’t Be Opened” Gatekeeper Alert Message on MacOS X, but still want to maintain the security levels: Right-click (or control-click) the application in question and choose “Open”. Click the “Open” button at the next dialog warning to launch the app anyway.