Hello, I upgraded my iMac from Lion to OS X Mountain Lion by downloading the update from App store. Now, I wish to install the update on my MacBook and do not want to download the whole 4GB dump again. The problem is I'm unable to locate "Install Mac OS X Mountain Lion.app" in the /Applications folder. The search does not locate the file either. I'm wondering whether the installer app is automatically destroyed once the install is completed. Is there any way I can get the installer back?