In game I can choose only subtitles language, but not voice language.

I assume it's not something you set outside the game, or have to download different versions based on the language?

The last post here seems to suggest it is set outside the game, but I'm not sure how this would apply to the GOG version.

"can i switch voice language in game ?"

"Yes you can. On steam library, left click the game and select "properties". Select the language to english. Then start the game.
After that, you can select any language for subtitles and menus in-game, but the voices will keep in English."

In GOG Galaxy:
Click the button to the right of the Play button > Manage Installation > Configure

No idea how to change the language w/ the standalone installer.

Thanks, through Galaxy I can change language :)

But there is still only one language for offline installer.

Open goggame-1724969043.info

Replace ... with ... ... in order to get polish language, for instance.

Thanks a lot.

I guess well' see an update soon. They also created a language setter for the LEGO games, where I usually had to edit the registry manually. So I guess they will add one here as well.

Thank you so much!

It worked for me in german, too. :-)