Most third-party websites claiming to offer an “El Capitan 10.11 DMG” are risky. They may contain modified system files, malware, or outdated versions. If you search for “os x el capitan 10.11 download dmg” , here’s what you commonly encounter:

Would you like the official Apple download link for El Capitan, or instructions on how to create a clean DMG from the official installer?

I understand you're looking for a review related to downloading as a DMG file. However, it's important to clarify a few key points before providing a useful review. Critical Context Apple no longer officially offers El Capitan as a direct DMG download for the general public. The legitimate way to obtain it (if your Mac supports it) is through Apple’s support page, which provides an InstallMacOSX.dmg (or a similar .dmg wrapper) that contains an installer app, not a bootable raw DMG of the OS.