Snow leopard to el capitan upgrade installs but doesn't upgrade.
My old iMac early 2006 still functions well although over the years has got itself a bit confused. I was running el capitan OS 10.11. I deleted everything from the hard drive to do a clean installation of Snow Leopard (10.6) and then upgrade online back to El Capitan. Snow Leopard installed fine from my disc and I found El Capitan on the Apple store (5.6gb) and downloaded it.
The problem is that it runs through the installation OK in just a few minutes but fails to upgrade the system and the imac is still on 10.6 Snow Leopard.
Just to clarify that I am aware of the security issues with these old imacs and do not use it for anything personal.
Can anyone help me here please?
Earlier Mac models