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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