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From: Jolly Roger <jollyroger@pobox.com>
Newsgroups: comp.sys.mac.system
Subject: Re: El Capitan keep installer
Date: 1 Oct 2015 21:53:18 GMT
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On 2015-10-01, Ant <ANTant@zimage.com> wrote:
>> >> Downloading now, but on very slow connection. Have several machines to 
>> >> update. Can someone please remind me how to preserve the download so I 
>> >> can use it for the other Macs?
>> > 
>> > Once it finishes downloading, quit the installer if it launches, then
>> > right-click the installer application icon and choose Compress. You'll
>> > end up with a zipped archive of the installer that you can archive or
>> > copy to other machines.
>
>> Note that, as has been discussed in other threads recently, if you let the
>> installer run rather than quitting it, the installer will delete parts of
>> it during installation. So if you want a pristine archive, you have to
>> cancel the install when it launches after the download from the App Store
>> finishes.
>
> Which parts are those?

Most folks are interested in the InstallESD.dmg which gets deleted. I'm
not sure what else may get removed, because I don't care enough to do a
listing to find out. Anyone who really wants to find out can list the
contents before and after running the installer to see the difference.

-- 
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JR