As noted by 9to5Mac, the latest developer build of OS X Mountain Lion released last week sets the stage for bringing iOS-like automatic app downloads to Mac App Store purchases.
Like on the iPhone and iPad, when you buy and install an app on one of your Macs, all of your other Macs logged into the same App Store account will automatically install the app too.
Unfortunately, the feature does not seem to be working completely. While the App Store will still offer to enable automatic downloads (as seen above), it does not actually install anything when you purcha…
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OS X Mountain Lion Bringing Automatic App Downloads to Mac
Eric Slivka – macrumors.com