You bought a CD, madness.
If you want to upgrade your Mac from Yosemite to another newer OS you have three alternatives..
El Capitan, Sierra and High Sierra are all available for download and are free.
It sounds like you have been trying to install updates to El Capitan downloaded from the Apple Support Downloads pages. If so you need to have already installed El Capitan, that is why you are getting the message about 10.11.
for example if you downloaded the 10.11.6 Combo update this will update any previous version of El Capitan from 10.11.0 to 10.11.5 to the last version 10.11.6. Please remember full versions of OS's are only available via the Mac App Store.
Depending on the age of your Mac you may not be able to upgrade to Sierra or High Sierra, if so you should be able to upgrade to El Capitan.
The OS X El Capitan 10.11.1 update improves the stability, compatibility, and security of your Mac, and is recommended for all users. This update: Improves installer reliability when upgrading to OS X El Capitan; Improves compatibility with Microsoft Office 2016; Fixes an issue where outgoing server information may be missing from Mail. Mar 20, 2016 Create El Capitan 10.11 USB Drive Installer on PC (With Windows, No Mac) This tutorial to help you create USB Drive Installer on Windows PC and This is. Download OS X El Capitan. All Mac users who wish to download OS X El Capitan must do so from the Mac App Store, where it is available as a free download from Apple: Get the final version of OS X El Capitan from the App store here; The El Capitan installer is about 6GB in size. Download Free Mac OS X El Capitan 10.11.1 Mac Dmg. Click on the button below to start downloading Mac OS X El Capitan 10.11.1 for mac OS X. We are here to provide to clean and fast download for Mac OS X El Capitan 10.11 dmg. This link is resume able within 24 hours. Keep visiting themacgo the world of dmgs.
Nov 25, 2016 Mac OS X El Capitan 10.11.1 InstallESD DMG Download Latest For Mac. Its full bootable ISO image of Mac OS X El Capitan InstallESD DMG For AMD & intel. Mac OS X El Capitan 10.11.1 InstallESD DMG Overview. OS X El Capitan is the latest major release from OS. Full Version Mac OS X El Capitan Free Download 10.11.6 InstallESD DMG Bootable USB Free Download Mac OS X El Capitan 10.11.6 Intel And AMD Bootable USB ISO.
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Have a look at the links below to determine what OS you would like to download. Bear in mind though that if your Mac qualifies for High Sierra then you will be denied the download of El Capitan.
The versions that will be downloaded in each case will be the latest versions of each OS, so for El Capitan it will be 10.11.6, Sierra will be 10.12.6 and High Sierra will be 10.13.3.
If you tried Erics link to El Capitan and you couldn't download it, then the App Store is recognising that you Mac qualifies for High Sierra, so you can upgrade to that or if you want you could also upgrade to Sierra from the link above.
I was very excited about the release of OS X El Capitan earlier this week. The OS upgrade is highly recommended as it vastly improves the performance of Macs (that are capable of running Yosemite). However, my experience with the upgrade process was not a pleasant one. It was only a few hours back that I was successfully able to upgrade my Mac. That was after the MAS download got interrupted 6 times in a row, and I had wasted more than 15 GB of data on a single download of 6.08 GB.
>> Install macOS Sierra on Mac [Direct Download] <<
>> Install macOS Sierra on Mac [Direct Download] <<
UPDATE:macOS Sierra has been released. Check out how to get macOS Sierra from outside the Mac App Store.