Update keeps coming back on MacOS
To solve it (it's no longer needed as it's discontinued and was used for media creation in apps like iTunes and iPhoto):

Open the Terminal app (Spotlight search for 'terminal')
Type sudo softwareupdate --ignore iLifeSupport902
It will ask you for your password, enter it (you won't see it displayed on screen)
Close terminal and restart your Mac

It should now have disappeared.