If you cannot use the official Apple link (e.g., you are on a Windows PC), community-maintained archives offer pre-made ISO files. : Always exercise caution with third-party downloads. Internet Archive - Mac OS X 10.11 El Capitan ISO : A 7.1GB ISO file uploaded to the Internet Archive. GitHub macOS-ISOs Repository
OS X v10.6.8 (Snow Leopard) or later installed to upgrade natively How to Get the Official OS X El Capitan Installer Mac Os X 10.11 El Capitan Iso Download
Even with a perfect installer, you might hit a roadblock. Here are the most common El Capitan installation issues and how to fix them. If you cannot use the official Apple link (e