How to add this facepack to FM18
Download the .zip archive and use a tool such as 7-zip for Windows or The Unarchiver for MacOSX to extract its contents.
Move the extracted folder to:
Regular FM: \Documents\Sports Interactive\Football Manager 2018\graphics\faces\

FM Touch: \Documents\Sports Interactive\Football Manager Touch 2018\graphics\faces\

Create the folders "graphics" and "faces" if they don't exist.

Open Football Manager 2018 (or Touch) and go to Preferences > Interface.
Click the "Clear Cache" button. Return to the same screen.
Enable "Reload skin when confirming changes in Preferences".
Click the "Reload Skin" button.
There should be a box that pops up saying 'loading image data for the new skin'. Once this is done, the facepack should work in the game.

Download
https://mega.nz/#F!mu5HGb7a!jTHkCLI6-ntGV7ps-oErtQ