Lykaon will be an adventure with several hours of gameplay and dialogue for The Witcher 2. It is made using Redkit, the official mod tool for the game. You will be able to explore large landscapes, fight countless enemies and experience a story which will be shaped by the decisions you make.
This demo is only an alpha version of the adventure. A lot of content is missing, there are still some bugs and the frame rate is not optimized (it will most likely only run well on high-end PCs).
Do you need to have the actual game to play the mod? Sorry if this is a stupid question, I've never played a modded game or even the Witcher 2 (YET!).
I think yes, You have to install the main game, MOD use resources from main game and adapted something of it.