Can I resume an interrupted download of Mac OS X Mountain Lion?

Solution 1:

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.

Solution 2:

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.