This error appears due to the Gatekeeper security feature included with OS X 10.8 (Mountain Lion) and later.
To bypass this, follow the steps below:
- Open your computer System Preferences > Security & Privacy > Privacy
- Here, you should see an option to click "Allow Anyway" next to the iZotope application in question.
If you prefer to keep Gatekeeper on, you can always revert this setting to default after installing your iZotope product.
*For newer operating systems (OS X 10.13 and up), the app you're installing will appear under the "Allow apps downloaded from" menu. Click "Open Anyway" next to this and your software installer will launch.
macOS Catalina 10.15+
Please head to this article for installation steps if you're on macOS Catalina.