(Shamelessly stolen from TA)

GOG is giving away a free copy of The Witcher 3: Wild Hunt or The Witcher 3: Wild Hunt - Game of the Year Edition on PC to all who already own a copy of the game on a different platform. This works for Xbox Game Pass subscribers who have already downloaded the standard edition too.

More info: here

Free until the 22nd or 23d. (My days are all mixed up here in Qatar.)