The Play Store and App store offer Apps to download for mobile devices and tablets. The MacBook is not a mobile device. You shouldn’t need an App to download your files, you’d do this by connecting the camera via USB to your MacBook or by inserting your SD card into the SDCard reader of your MacBook (if there is one). I hope that helps you? If you wanted to put an App on a desktop device or laptop you’d simply need to download something like Bluestacks, which creates a mobile scenario for this purpose. It effectively acts as a mobile vehicle to use Apps through but is not used often.