1 – Download the app using the following url.
2 – Locate the app in your Download folder and drag it into your Applications.
3 – Open your application
Your computer might open a warning dialog signalling that the app is not registered with Apple.
To override your security settings and open the app anyway:
3.1. In the Finder, locate the app you want to open.
3.2. Control-click the app icon, then choose Open from the shortcut menu.
3.3. 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.
You can also grant an exception for a blocked app by clicking the “Open Anyway” button in the General panel of Security & Privacy preferences. This button is available for about an hour after you try to open the app.
To open this panel, choose Apple menu > System Preferences, click Security & Privacy,
then click General.
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