In OpenIV navigate to:

MODS/UPDATE/UPDATE.RPF/COMMON/DATA/

and add this line in your DLCLIST.XML:

<Item>dlcpacks:/foxyxmas/</Item>

Save and next navigate to:
MODS/UPDATE/X64/DLCPACKS

Place the foxyxmas folder here

Thats it! 


By default the tree will spawn on Franklin's pourch. But you can spawn and place the model anywhere using a trainer that can call for props. Just enter model name "foxytree". 