Having difficulties to install El Capitan on my MacBook Pro

I can't get to El Capitan to install on my MacBook Pro 2012. I tried to remove and re - download several times, tried both Safe Mode. All I get is the following:

with the Rainbow wheel for 20 seconds, and then nothing happens. I was not able to find anything online to help. Does anyone have a suggestion?

Here's a tip to user you can follow: basic steps for the OS X upgrade.

Tags: Notebooks

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    A MacBook Pro and MacBook Pro with Retina display requires different versions of Windows due to their different abilities. Here is the information you need to determine what Windows operating system can be installed on your.

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    Install Windows 7 and older versions on your Mac with Boot Camp - this article explains what MacBook Pro models can install Windows 7 and previous versions, as well as the installation steps.

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