I purchased Mountain Lion through the App Store on my 10.7.5 MacBook Pro.
The download completed and I clicked through the prompts to choose an install location and agree to the terms.
I'm sorry to say I'm not sure what happened next as I shifted my attention to another computer.
I assumed the install process was running.
However, when I looked back at my MBP, I was back on the desktop with no sign of activity.
(It's conceivable that I clicked "cancel" by mistake -- I'm kind of tired/distracted/trying to juggle several things at once today.)
I went back to the App Store, looked under "purchases," and found Mountain Lion labelled as "downloaded" (as I would expect).
How can I restart the installation?
Can I go to the downloaded file and click on it? Where would I find it?