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Where can I download El Capitán for my iMac that’s from 2008
iMac Line (2012 and Later)
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To perform this action will require booting from a Bootable Installer.
This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer. Example : Bootable Installer of El Capitan would have to be done on a computer that Qualifies to run El Capitan.
If the computer being used to perform this task is Too New or Too Old - then this computer is not the machine to be used for this action.