Inside your retail copy there should be a code to activate on your account. After you activate that you should be able to download the game digitally and see everything in your account.
For more information on where to redeem the code visit the FAQ thread by mmarci.

Hope I could help.

Ah, i see. Thanks man. :)

Hey, I'm having a problem with downloading the DLCs, as they don't show up in my library, even though I "bought" them. I got an email with the confirmation of my purchase, though I can't download them. Any suggestions?

Um for those joining us late. If you bought Witcher 3 on GOG, all you have to do is download the DLCs from the website, not Galaxy and install it manually?

EDIT: nm, its in the first post as an edit now.

I went to the "configure" portion in Galaxy, and there was an option for Temerian Armor and Hairstyles. That's all thats released right now, right?

Do I still have to activate the dlcs ingame? I have installed them and I was wondering if I have to activate them like in TW2.

Next to that I read on a website (dunno which anymore =/) that the beard growth is stopped with the dlc. Is that right?

No, your beard still grows regardless of the DLC.
Once you installed the DLCs no matter using which method you don't need to activate them a second time in game.
However, you do need to purhcase the armor from a merchant and go to a barber to get your hair cut and your beard shaved. See the main thread for information (page 1).
Yes, more will be relaese in the future.

Hope I could help.

Thanks mate!!

So I need some code to actually connect the game? I don't seem to have any other code other than the witcher 1 and 2 preorder codes?

I am not quite sure what you are talking about.
Did you purchase a retail copy of the Witcher 3: Wild Hunt? Where did you get these pre-order codes exactly?
To my knowledge you don't get the two previous games with the retail version or any other version for that matter.

The way these DLCs are delivered, is rather confusing! You get absolutely no confirmation that these are in the game, so I ended up downloading them from the GOG site (not the GOG app - it does not work) and manually installed them.

CDPR really need to re-evaluate this system. Currently it is a convoluted mess! Go look at how streamlined Origin is, for example.
(Also the colour scheme GOG applies can be hard to navigate and read)

Aside from that, TW3 is an incredible game, definitely the best RPG I've ever played. Blows anything Bioware has to offer out of the water!

It's absolutely terrible. Game should show them, at least on galaxy, right next/under the main game/play button. At least list it right there where the Pass shows up. Should be trying to show/promote the additional content not hide it. (irregardless of money or no money)

Yes but what folks need to know as I have just found out today and I've been playing the game since day one is the fact that when you click the 'Connect Now" button when you enter the code on the booklet inside the retail packaging make sure your "caps lock" key is "OFF" otherwise you will in fact get an error reading.

Now I've got TW I and 2 which I pruchased a while back and have instassed on the puter any way to get them acknowledged by the gog system as well

Thank you OP! :-)

I didn't realize I had to do anything to make them work. :-o