Hi, I want to download Witcher 3 GOTY through GOG Downloader. I noticed thet you can choose different language options for the installer as shown in the attachment, in addition to separate language packs lower on the page. I want Witcher with polish text and polish voiceover, do i still need the polish langpack, or is the polish installer all i need? The faq or support pages aren't clear about this.

Thanks for all help.

EDIT: Polish installer has English voiceacting only, you need the language patch to get any other voice language.

I believe that language of the installer only affects the language during installation.
The language packs aren't large in size so I just recommend you to experiment with them.

For example:
I used the Eng installer & I had an option to switch in-game the text language but not the voice.

gogwitcher300

The GOTY includes all language options, there is nothing else to download as far as the game is concerned. The other downloads are for extra "goodies".