Beware of 10.11.6 is good advice. It updated fine on iMac and Macbook AIr but on my Macbook Pro...failed miserably! It would not boot. Spinner and beachball forever! Erased the drive and copied back from complete backup..FAILED! Had to do a clean install of 10.11.5 "migrate" from another backup and then update to 10.11.6. Now it works better than before. FAST! There must have been something damaged in the older OS though it seemed to be working well. All of the above took many hours. Lessons? Make a backup of your entire hard drive. Make more than one!
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