Step 1Move the downloaded file UEFA SUPER CUP.dbc in your Football Manager 2014 editor data folder:
Win Vista/7/8: C:\Users\<username>\Documents\Sports Interactive\Football Manager 2014\editor data\
Win XP: C:\Documents and Settings\<username>\My Documents\Sports Interactive\Football Manager 2014\editor data\
Mac OS X: /Users/<username>/Documents/Sports Interactive/Football Manager 2014/editor data/
Create the folder "editor data" if it doesn't exist.
Step 2Start a new career game (won't work with classic mode).
A little pop-up window will come up that says there is X enabled editor files. Click OK.