The Witcher Goodies Collection [GOG]
until January 5th 7AM Pacific
Not really a game but I don't care. Over 37 GB of art, soundtracks, and making-of videos is impressive in its own right. If you already claimed this back in May, the new content has already been updated in your library.
To download after claiming, go to
The Witcher Goodies Collection in your games library. Under the EXTRAS section you can choose which items to download individually.
https://gog.com/game/the_witcher_goodies_collection