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I started the update but comes up wth error when installing line is half way across with the apple symbol above the line.
I've done the diagnostic. But how do I quit the installer to restart, because if I click restart it tries to install & ends back at this screen
iMac Line (2012 and Later)
Shut down (power key long hold) and then boot up with the power key holding down D like it suggests
Shut down (power key long hold) and then boot up with the power key holding down D like it suggests
What exactly are you doing, that screen you have shared is a macOS High Sierra install screen.
Error with macOS Mojave 10.14.6
