The-witcher-3-wild-hunt-game-of-the-year-edition-gog-language-packs

Use the dropdown to select your preferred language. The client will then automatically download the necessary files (typically around 3-4GB for full audio). GOG Website (Offline Installers) : Access your GOG Account Library in a browser.

: English, Polish, German, French, Russian, Portuguese-Brazil, and Japanese. Use the dropdown to select your preferred language

Click on the game to see the "Extras" or "Backup Offline Installers" section. Available Language Support The game supports 14 languages

If you only need to change subtitles or text, check the → Language menu within the game itself. Available Language Support Use the dropdown to select your preferred language

The game supports 14 languages for text/subtitles and 7–9 languages for full voice-overs (VO), depending on the region.

You can select your desired language from a dropdown menu to download the full installation files in that specific language. :

Wild Hunt Game of the year edition - German language pack | Forums