Apple

Upgrading MAC OS X Lion 10.7.5 (11G63b) to Mountain Lion 10.8.4 (12E55)

Locate the “Install OS X Mountain Lion.app” and Launch it

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Click on Agree for EULA acceptance after reading the complete EULA

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Response Agree to confirm prompt

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Installer will present you with the disk details on which it’s going to install the MAC, verify and then click “Install”

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Authenticate this operation as an administrator user

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You’ll be presented with a progress bar showing up Preparation status

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Then click on Restart for the OS X install to trigger upon start up

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Choose “Close Other Applications…” to let the restart to take place

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Upon Successful installation, your system loads with Mountain Lion and you’ll be prompted for iCloud login which can be skipped

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Then on the next screen click on “Start using your Mac”

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Verify the MAC version by running “About This Mac” where software shall be shown as “OS X 10.8.4 (12E55)”

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Click on “Software Update…” click on “Update” for allowing “Updates are available for your computer”

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Click Continue on the next screen

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Once updates are successfully run, you’ll be prompted to restart your computer as shown below, click Restart.

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Then you’ll see Apple installing updates

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