You bought a CD, madness.
Download El Capitan ISO has released Safari 11 version; Has included supplemental updates in the security of the device and OS; Safari 10 has the ability to access OS X Download El Capitan and X Yosemite; OS X 10.11.6 El Capitan enhancement of bug fixes and security has been released too. Download El Capitan ISO System Requirements. Jul 18, 2016 Download OS X El Capitan 10.11.6 Combo Update This update is recommended for all OS X El Capitan users. The OS X El Capitan v10.11.6 Update improves the stability, compatibility, and security of your Mac, and is recommended for all users.
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.
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.
El Capitan Os X Download
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.
Os X 10.11 Download Free
Feb 28, 2018 12:24 AM