: Log in to your account on GOG.com and select the game.
: Run the downloaded language installer. It should automatically detect your existing game directory and add the new language assets. Configuring In-Game Language : Log in to your account on GOG
Click the (located next to the "Play" button). Navigate to Manage installation > Configure . : Log in to your account on GOG
The most efficient way to acquire and install the Brazilian Portuguese language pack is through the GOG GALAXY launcher . and navigate to your "Owned games" library. Select The Witcher 3: Wild Hunt . : Log in to your account on GOG