Hi, I've recently decided to buy my first MacBook after being impressed by the iPhone for a few years. The problem I have is that I can't update ML in the app store. My MBP is a late 2010 model and seemed to have a fresh install when I bought it. Is it possible that the OSX that has been installed isn't authentic? Is there a way to check this? Would buying ML from the app store for £13.99 fix this problem? I don't want to waste money if not. Please go easy on me as I'm still learning how this all works. Thanks in advance!