I have a 2010 MacBook Air and I recently bought an iPad Air. I was able to install Pages, Numbers and Keynote for free on my iPad. I was under the impression that I would be able to install the same apps on my MacBook Air for free too (that's how I understood it when Apple made these apps available for free with new device purchases). But when I go into the Mac App Store it still asks me to pay $19 for each of those apps. Am I missing something? Or did I understand the 'free' part incorrectly? Are those apps free only on the new device you buy?