Install mountain lion by using the .dmg from installer app

Posted by Leonardo on Super User See other posts from Super User or by Leonardo
Published on 2012-10-29T09:31:03Z Indexed on 2012/11/13 11:07 UTC
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osx-lion

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upgrade

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I already have a Mountain Lion Installer app, downloaded from Apple Store.

Now, I would like to install ML on another machine I own. I didn't want to download it again, so I copied the .app to the other machine and try to run.

Unfortunately due to some error about mac unable to run the .app I wasn't able to install.

Most tutorial suggest to make a bootable USB starting by the installer InstallESD.dmg, found in installer .app. I would like instead to run the .dmg directly.

So I have three 'propedeutic' questions:

can I just mount and run the .dmg without making a bootable drive ?
I do have backup, a TimeCapsule one to be precise. In case of failure, can I just use the previous backup, and restore to Lion 10.7 ?
from 'Apple Store point of view', would my machine be recognized as upgraded and elegible for future update ?

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