Use a Mac OS X installation Disc. If you’re unable to use Internet Recovery Mode or create a bootable USB installer, you can still use a Mac OS X installation disc. These discs are available for OS X Snow Leopard, OS X Lion, and OS X Mountain Lion. If your Mac is from 2012 or earlier, there was an installation disc in the original box. If you acquire the installer from another source, just downloading the file will not install the OS X right away on your Mac, you’ll need to find the file in your Downloads or Applications folder, then open and run the installer from the downloaded file. I can’t download an old version of Mac OS X. A downgrade is different than an upgrade. Because I have to test my OS X app with an older Mac OS X version (to make sure it is still compatible) I would like to setup a VM with an older OS X Version (El Capitan or Yosemite) using Parallels desktop. In order to create the VM a need the installer package. Download the latest versions of the best Mac apps at safe and trusted MacUpdate. Go to the developer's website & download v3.7.8 which works on earlier OS.
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