You can download the application for Mac from the Mac App Store. If you are on a Mac, simply open the App Store from the dock and then enter Vudu. The app is called VUDU now and it doesn't allow public downloading unless you are on a Mac, that's why the lack of a direct download link for Mac Informer.
Use the following link to access the page: https://itunes.apple.com/us/app/vudu-player-movies-tv/id487285735?mt=8
If you click on View in iTunes button, the App Store will open automatically. Make sure that you are signed in.