As I am about to venture out of Snow Leopard Land into the Bright Shiny New World of OS X 'El Cap,' there's cause for concern - and this question: Is there any way to prevent the OS from auto-installing immediately upon completion of download? I do not want it to install until I want it installed - which is after I'm backed up, etc. Can I perform any kind of action to save the installer as a .dmg file on a thumb drive or an external hard drive, or is that possibility prevented by the OS's .dmg directive(-s)?
If it's possible, please provide steps required to successfully download and then store the El Cap installer as a .dmg until I'm ready to activate the OS. Thanks in advance.
Someone else asked a similar question previously so here's my detailed response on MacInTouch.