OS X Mavericks disappears after downloading

Chances are I am being an idiot... Nevertheless I am trying to download OS X Mavericks from the app store. The download works well and I can see the OS X Mavericks icon in my Launchpad. However once the download finishes (I have never actually seen the finish) the program seems to disappear. Any one got any ideas?

Uninstall that garbage first, and verify all its remnants are permanently eradicated from your Mac. Then, boot OS X Recovery by holding ⌘ and r (two fingers) while you start your Mac. At the Mac OS X Utilities screen select Reinstall Mac OS X. Doing so will restore any required OS X system components that may have been removed or corrupted from having used "CCleaner", but will not repair other programs that may have been corrupted from using it. You may need to install them from their original sources.
Do not use "CCleaner" or anything like it, ever again.
Following that, download Mavericks from the App Store and install it.

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<blockquote>Locking duplicate thread.<br>
Please continue here: [[/questions/913692]]</blockquote>
how do I get the fire fox back after some how the user changed to yahoo/ask. do i have to delete it and start over? how do i do that.

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In which country are you located and which App Store are you accessing?

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OS X Mavericks disappears after downloading

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