Updating Ignition on Mac Mini

I have inherited an installation where another Integrator installed Ignition V7.7.4 on a Mac Mini ( 2014 ) OS Yosemite. I realize the installation requires using the terminal and typing in commands.

Can someone outline the sequence of commands I would need to enter to upgrade the Ignition Gateway to V7.7.5?

EDIT: oops! Inductive University has a video on this. :blush: