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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?

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Check your /Applications folder. After downloading Mountain Lion, the installer is placed there (entitled Install OS X Mountain Lion).

It will be deleted after installation, but should still be present on your machine if you have not upgraded yet.

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    As an aside, since you have multiple computers, it may be worth pointing out that before running the Install OS X Mountain Lion app, you can copy it to a separate drive or USB memory stick, etc. This way, you can install it on all your computers without having to wait for it to download on each of them separately. – Kent Jun 26 '13 at 3:05
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Look for Install OS X Mountain Lion in the Launchpad or Spotlight. It looks like this:

Install OS X Mountain Lion

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