It's already posted 11 months ago, just a heads up :)
https://www.steamgifts.com/discussion/9GOho/free-gog-the-witcher-enhanced-edition
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https://www.gog.com/gwent-welcome-bonus
if an error accurs or the game isn't free yet, you must claim GWENT game using GOG.com launcher first
https://www.gog.com/game/gwent_the_witcher_card_game
download and install the exe file from link above
login using your GOG account
on dashboard, click add game manually
look for GWENT: The Witcher Card Game
click install
you may abort the installation because at this moment that GWENT game has been claimed
open the top link using your browser with your GOG account logged in
click subscribe and claim to claim GWENT Card Keg Pack
and then, click once again to claim your copy of The Witcher: Enhanced Edition
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