11 Replies Latest reply: May 14, 2013 12:50 PM by keg55
gurdulu Level 1 Level 1 (0 points)

Hi,

I would like to know how to simply re-download OS X 10.7.5 in order to create a bootable usb device to reinstall my OSX.

Since my first macbook in 2006, i've always upgraded and then migrated my system and never reinstalled it.

That's  quite a performance, but these days it's slowing down and showing some bugs, so I thought I could give it a fresh install, but I don't know where to get the osx archive without having to wait for the whole downloading to finish before using my mac again.

Sorry if not clear, english is not my language..

Thank you in advance!

 

PS I'm not interested in upgrading to 10.8 for now.


MacBook Pro (13-inch Late 2011), Mac OS X (10.7.5)
  • 1. Re: how to download os x before reinstalling
    keg55 Level 5 Level 5 (5,925 points)

    Assuming you purchased Lion (10.7.5) from the App Store, you can open the App Store, press/hold the Option/Alt key and click on the Purchases tab. From there you should see Lion in your purchases and download it. After the download completes and you're presented with a screen to Continue, do not press continue. Right click the Install OS X icon on your Dock and Quit out of it. Now, locate the OS X Install app in your applications folder and follow this link's instructions on extracting the InstallESD.dmg file and putting it on a USB thumb drive (8GB).

  • 2. Re: how to download os x before reinstalling
    gurdulu Level 1 Level 1 (0 points)

    Thank you for your quick answer.

    The first tip you gave me doesn't work: when I Option/Alt  (or both)  and click on the "purchases", i only see garage band, iphoto and imovie, just like when I simply click  (oh, and the little grey cog shows up very briefly on the left) .

    Actually I had already seen this instruction in some discussion but since it didn't work on my mac, I assumed that maybe I was missing something, or that the person giving the instruction was wrong or not explicit enough. Could the problem come from my machine?

  • 3. Re: how to download os x before reinstalling
    keg55 Level 5 Level 5 (5,925 points)

    Are you holding down the Option key while clicking on Purchases? Assuming again, that you purchased Lion from the Apps Store with your Apple ID, you should see the Lion icon on the left side of the Purchases screen with the Download button ungreyed.

     

    If your system came preinstalled with Lion, then it's a different procedure.

  • 4. Re: how to download os x before reinstalling
    gurdulu Level 1 Level 1 (0 points)

    Ok, I DIDN'T purchase Lion from the app store, it came preinstalled in my macbook!

    Could you please explain to me the other procedure?

  • 5. Re: how to download os x before reinstalling
    Topher Kessler Level 6 Level 6 (9,340 points)

    If your system came with the version of OS X you are trying to install, then you will not be able to create a boot drive from it. You will need to boot to the OS X Recovery HD partition by holding Command-R at startup (or to Internet Recovery by holding Option-Command-R), after which OS X 10.7 will download from the App Store when your system logs in and is recognized as having been originally shipped with 10.7. Technically the installer files do download to your system, but you will not have access to them so you cannot create a separate boot drive from them. The only way to do this is if you have purchased OS X from the App Store, where you can then download it to your system and extract the installation files.

  • 6. Re: how to download os x before reinstalling
    keg55 Level 5 Level 5 (5,925 points)

    The best way is to:

     

    Plug in a USB external drive

    Restart into Internet Recovery using the Command+Option+R keys. This boots into Apple's servers and their Recovery HD so you can download the specific version of Lion for your Mac.

    Select Install or Reinstall OS X from the OS X Utilities Menu. Point to your external USB drive to install on.

    IMPORTANT: You will need to pay attention to the download. After it finishes and when your Mac restarts. At the black screen, unplug your external USB drive and your Mac will boot to your normal Desktop.

    Plug your USB external drive in and navigate to the OS X Install Data folder and extract the InstallESD.dmg file. Copy this file to your Desktop.

    Using a bootable (Mac OS X Extended-Journaled - GUID partition table) USB 8GB thumb drive, open Disk Utility, select the USB thumb drive and click on the Restore tab. Select your Source file as the InstallESD.dmg file on your desktop. Select your USB thumb drive as your Destination. Click the Restore button. This will create a bootable USB thumb drive with the Lion installer so you can boot from it and install Lion.

  • 7. Re: how to download os x before reinstalling
    Topher Kessler Level 6 Level 6 (9,340 points)

    Ah, good approach.

  • 8. Re: how to download os x before reinstalling
    gurdulu Level 1 Level 1 (0 points)

    Thank you again so much for all your answers.

    I'm thinking I'll need a substantial amount of time ahead of me to try these solutions, so I'm not going to do this before next week-end, and I think I'll try keg55's suggestion. (because I'm not a huge fan of this not having any handy way of reinstalling your os, knowing that even with a dvd or bootable disk, it always takes several hours to have your machine ready to go again).

    The  last question before I try is: once the download has finished, does your mac prompt you to restart, or do you have to take a look at your screen now and then and when it's like 97% done, get ready to jump on your external drive to unplug it otherwise it's too late?...

  • 9. Re: how to download os x before reinstalling
    Eric Root Level 6 Level 6 (16,195 points)

    Holding down the option key while clicking the purchases tab doesn't allow me to download items that show as installed?????

  • 10. Re: how to download os x before reinstalling
    keg55 Level 5 Level 5 (5,925 points)

    gurdulu wrote:

     

    The  last question before I try is: once the download has finished, does your mac prompt you to restart, or do you have to take a look at your screen now and then and when it's like 97% done, get ready to jump on your external drive to unplug it otherwise it's too late?...

    You have to watch it as you will not be prompted to continue. That's why I put IMPORTANT and bolded that step. If you let it restart before unplugging the external drive, it's too late.

  • 11. Re: how to download os x before reinstalling
    keg55 Level 5 Level 5 (5,925 points)

    Eric Root wrote:

     

    Holding down the option key while clicking the purchases tab doesn't allow me to download items that show as installed?????

    His Mac came preinstalled with Lion.