Why did this question get marked as duplicate of this question and closed?
I think the scenarios are opposites: I want to upgrade without using an external drive and the supposed question I duplicated is about creating USB drive to upgrade.
My problem is, I have an OS X Mavericks dmg file. I have tried OS X install app but, after agreeing to software licence agreement, when I click to install, nothing happens.
I want to know if it's possible to upgrade Mountain Lion to Mavericks from the installer dmg file without using an external drive -- as it doesn't seem to be working for me.