If you do not have the Mod Loader installed, you can download it from here.
One click install doesn't work if you've installed the Mod Loader without administrator permissions.
You can fix one click install by launching the Mod Loader as an administrator and hitting the "Reapply" button in the settings.
That's right, you can now be supported in battle by everyone's favourite mascot: Unity-chan! Is she qualified to fly that aircraft? I can't say...
You also need the custom wingmen mod for this voice to show up in-game.