The offer is open to players who already have the console or PC version of the RPG, which celebrated its fifth birthday in May and has sold some 30 million copies.
The GOG Galaxy app lets you unite multiple software libraries into one, connect with your friends across all gaming platforms, and launch PC titles, among other features.
To claim a free GOG copy, you need to connect the platform where you own The Witcher 3 with GOG Galaxy, which will import the progress you’ve already made in the game such as achievements.
The GOG version features exclusive digital bonuses including an extended soundtrack and comic book The Witcher: House of Glass. The offer runs until June 23.