it won't let me update the OS X El Capitan version it fails
it won't let me update the OS X El Capitan version it fails to update it
it won't let me update the OS X El Capitan version it fails to update it
Ok try explaining a bit better.
what are you trying to do, update an existing install of el Capitan.
Download OS X El Capitan 10.11.3 Combo Update
Or are you trying to upgrade an older OS to El Capitan.
it won't let me update the OS X El Capitan version it fails