Quote Originally Posted by Fri View Post
So where would I have to save the files in order to get this to work?
From the info provided at the github link in the Marlin configuration.h file -

Installation:
extract LiquidTWI2/ into <arduinosketchbook>/libraries/LiquidTWI2

I haven't actually installed and tested this, but it seems you go to wherever you have Arduino installed, look for the libraries folder, and you should end up with a folder there when you are done named LiquidTWI2.