OK lets forget trying to go to Nouget.. How do I get March 2016 update to work?

OK, I see that there are many problems with the Nougat currently so I will not consider that. What my problem is is that I have the November 2015 build and I have a March 2016 security update that simply does not work.. I always end up with the Robot lying on its side and a red mark and ! and the word I think "failure" ? I have tried this 3 times now with same results.. My bootloader is unlocked.. What am I doing wrong as it basically was downloaded and all I had to do was to push the install option but I always wind up at the end with the robot on its side?

Thank you

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