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Download the zip, unzip, drag and drop to Applications, double click :)

I must be an idiot but unzipping the zip just shows project / package contents. http://i.imgur.com/5uUzI.png ?

You downloaded the project source code, you should download the link below that on the page http://imgur.com/y4NjL

that's because you downloaded the source instead of the app. the link to the app is at the bottom of the page or here: