I downloaded the update from the Mac App Store and am again trying to update the 2010 Mac Mini. I tried USB thumb drive and Mac App Store download before and both just kept rebooting and not installing. I reinstalled Mavericks and just left it there but u want to get iPhoto to work so needed to upgrade. Our had Bern on the progress bay maybe a half hour and is still only a sliver done. How long should this take?