I purchased mountain lion and was invoiced for it, but I'm not sure it installed. Please help?!

see subject title ^

Click the Apple symbol in the upper left of your computer and then click About this Computer that will say what version of OS X is installed. If you are running Mountain Lion it will say so. If you are not then open Launchpad locate the Mountain Lion download and double click it, this will begin the install process. From there simply follow the on-screen directions.

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