Boxer Cup Germany Series
Copy the GameData and Series folder in the Automobilista main folder.
If you have an older version of the Skin Pack and do not want a mix of original Boxer and the Skin Pack then follow the next points.
Here are the original Skins For Original Boxer Cup folder.
Delete the Teams folder in "Steam \ SteamApps \ common \ Automonilista \ Game Data \ Vehicles \ BoxerCup"
Then copy the GameData folder from the extra Download with Original Skins in the Automobilsta.main folder.
Now you have the separate Original BoxerCup and Boxer Cup Germany. No more Skin Mix.
If everything is OK then it was the last update.