Man, Apple makes it tough on developers. This message is all about trying to force everyone to put their apps in the App Store so Apple can charge a tax on them. Seems like it gets harder with every new Apple OS release to avoid it.
Here's what Apple says about unidentified developer apps:
If you try to open an app that is not registered with Apple by an identified developer you get a warning dialog. This doesn’t necessarily mean that something’s wrong with the app.
Thanks guys for blocking it then!
Here's what they say will cure the problem:
To override your security settings and open the app anyway:
- In the Finder, locate the app you want to open.
Don’t use Launchpad to do this. Launchpad doesn’t allow you to access the shortcut menu.
- Control-click the app icon, then choose Open from the shortcut menu.
- Click Open.
The app is saved as an exception to your security settings, and you can open it in the future by double-clicking it just as you can any registered app.
Note: You can also grant an exception for a blocked app by clicking the “Open Anyway” button in the General pane of Security & Privacy preferences. This button is available for about an hour after you try to open the app.
To open this pane, choose Apple menu > System Preferences, click Security & Privacy, then click General.
Sometimes, even all that won't work. Here's a recipe a customer sent me that worked:
Disable your GateKeeper Security through the Terminal App with the following command syntax “sudo spctl —master-disable”, go back into security pref’s enable “apps from anywhere’, then install GWizard, then go back too terminal and then return Gatekeeper to default “ sudo spctl —master-enable”
