If you are currently playing with CombiPack Rock you can easily switch to this winter edition:

1. Open the saved games folder (found in the Options menu of the game)

2. Close the game

3. Go into the 'saves' map and edit your savedgame.PRISON file with Notepad++[notepad-plus-plus.org]

4. Do a search for Mods

5. Replace the CombiPack line (the example below assumes you also got the Chief mod)
6. Save the .PRISON file to a different name so you have a backup of the old prison.

7. Edit the preferences.txt (one folder up) and change the Mods line:
DO NOT touch the empty spaces behind the end of this line!

8. Start the game. It will load the new mod and your prison is ready to go.