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 ?