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Mac install unregistered developer issue;
In the Finder on your Mac, locate the app.
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.
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.