Magrippinho very helpfully created a YouTube video on how this file should be installed. Some of the contents are different - but the procedure is identical.
Or, you can follow the below instructions to install this file:
Step 1: Go to
Program Files \ Steam \ SteamApps \ common \ football manager 2013 \ data \ db \ 1300
Program Files \ Steam \ SteamApps \ common \ football manager 2013 \ data \ db \ 1330
USERNAME \ Library \ Application Support \ Steam \ SteamApps \ Common \ Football Manager 2013 \ Data \ db \ 1300
For Mac Lion users, the Library folder will be hidden. Use this link to find out how to show it.
USERNAME \ Library \ Application Support \ Steam \ SteamApps \ Common \ Football Manager 2013 \ Data \ db \ 1330
Step 2: Delete the dbc, edt and lnc folders from the folder above
Step 3: Copy the dbc, edt and lnc folder from this download into the folder mentioned in step 1.
Step 4: Go to:
Step 5: Open the folder named "editor data" contained therein. If it does not exist, then create it.
Documents \ Sports Interactive \ Football Manager 2013
Step 6: Keeping the folder in step 5 open, go back to the file you downloaded and open the folder named "editor data files".
Step 7: Copy the 30 files in the folder from step 6 into the folder mentioned in step 5.
To check if the file is working, go to the Champions Cup and EURO Vase, and they should be renamed to Champions League and Europa League respectively. If you are in the middle of a save-game, German national teams will be populated in the next instance that players are called up, and not instantly.
If you want to put this file on another website. Please link to this page, but DO NOT under any circumstances rehost this file on your own servers.