Oct 17, 2017 Starting with Mac OS X Lion, Apple added a security feature called Gatekeeper that only lets us install apps from the Mac App Store. Obviously, the same feature doesn’t let you open apps from unidentified developers on Mac OS X.
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The file is named AppInventorSetupvX.X.dmg where the X.X is the version number.) If you get a message that you cannot install an application from an unidentified developer, control-click the app icon, then choose Open from the shortcut menu. Click continue. Read and accept the software. When you attempt to install the software in Mac OS X Mountain Lion (v10.8) or later, 'The software cant be opened because it is from an unidentified developer' is displayed. Jul 02, 2013 Support Communities / Mac OS & System Software / OS X Mountain. Or right-click on the installer and choose Open. It will then ask if you want to go ahead and install the app. Jul 1, 2013 4:43 PM. But when I tried to use it I got the message that it couldn't be opened because it was from an unidentified developer (not chosen on. Click OK to open the app. Sierra adds the developer to its internal list of identified developers so you can open other apps from the same developer. The long way to open an unidentified.