How to make an offline 10.8 installer on USB?

Discussion in 'MacBook Pro' started by jamestj, Sep 21, 2012.

  1. jamestj macrumors newbie

    Sep 21, 2012
    I am just bought a Retina MBP with 10.8 pre-installed, the problem is when I want to do a fresh OS re-install, I use the default install mechanism by press the CMD+R during the boot and select online install, but it take me more than 12 hours to download and still not finished yet.
    I understand this might due to the poor network speed and also apple does not built-in a good multi-thread download mechanism.
    I am start think about the possibility of use some download tools to download the MacOS10.8 offline and then build a 10.8 installer on USB, then use the USB to install the OS.

    My question is: How can I find the original install dmg file? There are some article in the internet says you can download it from app-store. So I log-in into the app-store, click the OSX10.8. It's seems the app-store does not recognise I am already a legal user for the 10.8 and still ask me to pay for it.
    Anyother way instead of keep waiting for another 24 hours?

  2. Tea-Aholic macrumors 6502


    Dec 8, 2011
    Melbourne, Australia
    AFAIK, if your computer was shipped with Mountain Lion, the only proper way to reinstall the OS is to download using internet recovery (Command+R).

    Mine was shipped with Lion, so Apple gave me a code to download ML from the App Store meaning I was able to create a USB.

    I guess if you have a 'friend' that will let you download their copy of the OS.

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