Step 1
Move the downloaded file voasys_lower_level_update_l9_61161.dbc in your Football Manager 2014 editor data folder:
Win Vista/7: 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 2
Start a new career game (won't work with classic mode).
A little pop-up window will come up that says there is 1 enabled editor file. Click OK.
Step 3
After this click on England, then Next Game overview in the corner.
It will then bring up the lowest league, when you click the menu you can go lower! Click this then Start Game on the right.