Getting to 10.11.6
How do I upgrade to 10.11 before going to 10.11.6
How do I upgrade to 10.11 before going to 10.11.6
You're trying to install from the wrong thing, the updater, and you should be using the main installer:
Upgrade to OS X El Capitan - https://support.apple.com/HT206886 - "OS X El Capitan remains available for Mac computers that can't upgrade to macOS Sierra, or that need to upgrade to El Capitan first."
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Getting to 10.11.6