Why El Capitan updater works where Yosemite does not work

I bought a 2011 MBP MC721LL/A...still had 10.8.5... tried to upgrade to Yosemite but no luck... tried El Capitan and it worked fine... what gives?

Not sure that Apple is sign and certify the Yosemite for use more - they are encouraging El Capitan

Tags: Notebooks

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