System won't update to newset OS


guys i'm stumped on how update system. know sounds noob question, i'll download update , system won't install update , i'm quite lost on how force system revert newest os. system isn't old i'm not sure of model number it's 27inch nvidia 750m gt , i'm 3-4 os behind.

again wanna know how force update, thanks.
 

mmmm, 27inch macpro, i'm not familiar model.o_o

maybe question better off posted in imac forum?
 


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