https://www.gamespot.com/articles/the-witcher-enhanced-edition-is-free-on-gog/1100-6458421/

There's a good chance you've played--or at least been intrigued by--The Witcher 3. There's also a good chance you missed out on Geralt of Rivia's first outing. Now's the perfect time to right that wrong by grabbing a free copy of the game that started it all. Right now, GOG is giving free copies of The Witcher: Enhanced Edition to anyone who plays games on PC.

Since there's no such thing as a free lunch, you will have to jump through a hoop or two before you can hit that download button. For starters, you have to install Gwent: The Witcher Card Game. It's free to play, so that's not a huge deal. And if you've dabbled in the card-playing mini-game in The Witcher 3, you'll know it's an enjoyable pastime on its own. You can download it here.