I have a macbook pro 2015 (bought new from best buy 2017) and had this problem from the moment I removed it from the box. When I bought it, it had the old operating system, I think it was OS X Yosemite. They just came out with el Capitan, so before I cluttered up the computer I downloaded Capitan. It took over 35 hours on a brand new fresh never used pro! Now I am in the process of upgrading to High Serria, and at 35 hours and it's still not loaded! My home mac computer is 10 years old and only took 2 hours to install. Is this something wrong with the iMac pro laptop? All I did in all cases was go to the apple icon, clicked updates and the clicked download for the new version. I have downloaded other programs on my laptop, and never had this problem, every other download worked fine, just the apple upgrades.
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