In the Demo Edition of COTW, you are very limited to how you can play, only having access to the starter loadout (243, Cavershan 12G, 357, Binoculars, Roe Deer Caller, Deer Bleat Caller, Predator Jackrabbit Caller & Scent Eliminator) and all other equipment except from the starter weapon ammo will be locked until you buy the full game, the only place you can hunt is Hirschdof, Hirschfelden and if you try to leave the location, the game will either tell you to buy the full game or teleport you back to the nearest outpost. You also don’t have access to multiplayer, weapon customisation, trophy lodges or sleeping until you buy the full game.
If you buy the full game you’re demo save will be on the full game including your progress into the game, animal populations, saved/taxidermied animals, etc.