OS X Mountain Lion Corrupted or Tampered PLS HELP

flimzy

macrumors regular
Original poster
Apr 16, 2013
112
1
Hi guys, I downloaded OS X Mountain Lion to upgrade my previous OS X 10.6.8 version. It downloaded over night, and I checked to see if it completed and the full 4.3 gb or so downloaded completely. However when I opened the installer, after a couple of minutes of installing a message came up that said the application can't be verified. It may have been corrupted or tampered with during downloading. Please can someone help me with this, I tried restarting the computer but I don't know what else to do?
 

leman

macrumors G4
Oct 14, 2008
10,292
4,818
Where did you download it from? Anyway, if your system is unbootable, you must have a recovery/installation disk somewhere, try using it.
 

flimzy

macrumors regular
Original poster
Apr 16, 2013
112
1
From the AppStore. And I am not sure but will that fix it?