Hello, I installed the game and played a little in English. Decided to try other languages and downloaded the Russian voice package.

When I try to install the package, the installer tells me:
"This patch does not support your version of the game please download a new installer"

what can I do here?

I just bought the GOTY version so the files are all the actual ones that I have just downloaded.

Tryed the German voica package, doesnt work either.

How did you install it? Did you use GOG Galaxy or the offline installer downloaded from the website?

I have downloaded the files. Dont use GOG Galaxy.

Solution:

The following sequence must be observed when installing the language files:

1. Install the game GOTY V1.31.
2. Install the language pack.
3. Install the patch V1.32.

You have to install the language pack first and then the 1.32 patch. Unfortunately, it doesn't work the other way around.

Edit:
If the order is not followed, the following message appears:
"This patch does not support your version of the Game."

KingCross is right: you have probably patched the game before trying to install the language packs: it's a common mistake as GOG is not clear at all abaout the correct installation procedure.
Unfortunately you have to uninstall the game and then reinstall it again following KingCross's instructions in order to solve the issue, but then everything should work flawlessly.

Happened to me as well. I assume GOG want's to promote their Steam-esque software by making it harder for people to install offline. Like, it's sooo easy when you use GOG Galaxy....

Witam usunąłem grę z biblioteki a chodzi dokładniej o wiedźmina 3 gra edycja roku którą zakupiłem ponad rok tem grałem w nią ale musiałem ją odinstalwoać bo nie miałęm miejsca i przez przypadek usunąłem ją z biblioteki da się coś zrobić??

There is no way you can delete a game from your library (only support staff can do that, and they haven't) as your profile shows you have the game.
You just need to re-download it.

pobrałem ale wyskakuje mi bład E6