How to download El Capitan DMG? Go to the El Capitan page by going through the Mac Apple Store. Click on the ‘Download’ button in the El Capitan page and then a file named ‘Install OS X El Capitan’ will be downloaded to your Applications folder. Once the download is done, the installer will open automatically.Dec 23, 2019 Sorted? Well, let’s move to the downloads section now. Mac OS X El Capitan..