I have a weird problem now. When I first installed the HoS expansion I played it in Polish and everything worked good. Since then, I have reinstalled the whole of Witcher 3 on a new disc, I installed HoS and enjoyed it again although in English this time (just to see how it works in that language). But now that I've downloaded BaW I wanted to change all the language into Polish for all the parts of the game. And now's the weird part - I can DL the language pack (polish) for the main game. And the multi,anguage pack for the BaW. But there is none for HoS suddenly, and when characters speak - no sound comes out. Just the subtitles tell me what;s happening.

It sucks, 'casue I want to finish HoS before starting BaW (I lost the saves I made after the first playthrough), so now the question is - where can I find the Polish language pack for HoS? Or do I already have it and it's just not working?

I do not know of a fix but I too have this kind of problem - But with german instead of polish language.
One example:
The Rune merchant introduced with HoS > No voice at all in any conversation, even the "strings/sentences" used while doing business with other merchants which play are not played with that rune merchant.

I have the same problem as the posts above with ther german language pack. There is a depc.w3speech file but there is neither sound nor lips-movment in all conversations form Hearts of Stone.