On Oct 7, 2013, at 10:46 AM, Dan Crutcher <[email protected]> wrote:
> In days of yore when a new Mac OS version came out, I would order the disks > and use that one set of disks to install the new version on various Macs at > work. Now that it's all done through the App Store, I'm not sure how (or > whether) I can do that. > > Can I download the new version from the App Store to my computer and copy > that download to other computers and install it on them? Or do I have to go > to the App Store from each computer I want to install it on, enter my Apple > ID and download and install it anew each time? (1) Download the installer from Apple. This will show up as a package in the Applications folder. It's called something clever like Install OS X Mountain Lion. Don't install off this copy in the Applications folder because Apple deletes things after an install! (2) Show the package contents by right- or control- clicking the Install OS X Mountain Lion file. (3) Drill down to get to a file called InstallESD.dmg. This is the installer disk image. I think it's under Contents/Shared Support, but I don’t have an image handy, so this is a guess. (4) Use your favorite disk munger to make it into a DVD or a flash. You can do it with Disk Utility. I usually use Toast. If you do the disk route, you'll need a double-density DVD blank because it's a smidgen too big to fit onto a standard 4.7GB disk after it has been expanded. But, I highly recommend using an 8GB flash drive because using it to install an OS is a lot faster off a flash. (Think hours faster.) To use it, just use the DVD or flash as a boot drive and follow the prompts. I've made several of these for people, and they work fine.
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