Downloaded and installed version 2.0 from GOG. Polish voiceovers and text are missing. I can't really understand why patching Witcher 2 is such a painful experience. C'mon , it is hard to tell which version one is currently running. Not to mention the plethora of various patches that are incompatible with each other. Shame on you CDP! Great game otherwise, but your service lags way behind

Thanks TPR for that solution, unfortunately I have the same problem and tried this patch, but it only adds subtitles.
If anyone knows how to add polish voices,it would be very nice.

Tried it too - adds subtitles, but no voices though

If you want to have polish voices than you have to download polish language voice-overs. You'll find link to them on this web http://www.en.thewitcher.com/support/#q26 . Look for Language packs installation section. Enjoy;)

Weird... It worked for me though.

Just to be sure (I know it may sound stupid) make sure that...

-The international patch you downloaded (from official W2 website) is over 900MB
-During installation choose the language you want for the play
-Open the launcher, go to options and chanage text and VO to language of your choice
-Save and close option panel. Then close the launcher!
-Then open it again and run the Witcher... see if that helps...

Good luck... My solution works of course ONLY if you downloaded and installed polish VO pack earlier and after that you applied the 2.0 patch...

Thank you very much. I tested your way and it works perfectly ^^
Let's hope GoG will update the game and adds Polish voices in a future update.