I have an iMac which I just installed El Capitan from the Apple Store. I had to load Oracle Virtual Box with Windows XP to run an old piece of software that will never be in Mac. I have just purchased a MBP late 2011 2.6 IG to replace my aging Thinkpad x200(which runs Ubuntu). The MBP has Mavericks 9.5 on it. Since I made a bootable clone of El Capitan on an external USB 3.0 Drive, my question is whether I can upgrade the MBP using the bootable clone of El Capitan on the portable external USB 3.0 Drive?