Mac OS X version and codename

I immediately upgraded my Mac to OS X Yosemite, so I’ll show you how.

Before you upgrade

If you upgrade from “OS X Mavericks” on which “Mcafee Internet Security for Mac” is installed to “OS X Yosemite”, the OS may not start (confirmed on October 16, 2014).

What to do if Mac OS X Yosemite won’t boot after upgrading

Upgrade Mac to OS X Yosemite

First, download OS X Yosemite. Access the Mac App Store from the link below and launch iTunes.

  • In my case, the download was completed in about 10 minutes. I think it depends on the line status and the status of the App Store server. The Dock has a flat design, but it doesn’t look like Yosemite as it is, so let’s set it up a bit.