I downloaded El Capitan, but cannot install it

I have a Mac book pro 15 inch Retina and even if he says it's that el Capitan is downloaded the link is grayed and I can't install it.

I am running Yosemite 10.10.5

Thank you

What happens when you try?

Error messages?

You started the upgrade by double-clicking the installation file (install Mac OS X El Capitan) contained in your applications folder?

Tags: Mac OS & System Software

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