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I have a slow internet connection. I want to download Mountain Lion (Mac OS X 10.8) from the Mac App Store and resume the download if it gets interrupted because of my internet connection.

Does the Mac App Store allow resuming broken downloads?

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Yes - the App store handles interrupted purchases without intervention in most cases. There is a support article if you want to nudge things or it manages to wedge itself.

You don't have to let the download complete on iOS or Mac OS X and can control things on the Mac side of the store much better than on iOS.

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I've also noticed that when you switch from wifi to ethernet, the Mac App Store automatically continues to download via ethernet. – gentmatt Jul 25 '12 at 15:13
So i can download with Resume. Thanks. – John Major Jul 25 '12 at 15:17
As well, you can click on the app icon that's downloading in Launch Center to pause it. – Aaron L. M. Goodwin Jul 25 '12 at 19:06
i've tried it and it completed about 25% downloads then i puased. when i've resumed it started from beginning! crap! – HungryCoder Jul 26 '12 at 8:12

The Mac App Store does allow to resume a download, however things do not seem to work out always as expected - to be safe download it all in one piece.

Yesterday, I downloaded Mountain Lion from the Mac App Store - halted it - and resumed later without having restarted the Mac. The whole download started over. This is not the first time I have encountered it - therefore I do not take the pause/resume feature for granted.

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