Last night I bought the Pages app from the Mac App Store on my iMac. I know when buying Apps on my IOS devices (iPad and iPhone) that I can buy it on one of them and it automatically downloads to the other. Is this the same with the Mac App store? Esentially I'm asking if I'll be able to download Pages on my MacBook Air for £0 as I have it on my iMac? Or do I have to buy it again for the MBA?