I seem to be missing a serial for Ancient Relics in my account. I can download the offline installer but there is no serial in the list.

Anybody else missing one?

Yes, it´s the same for me. It´s just not showing up in the list.
Cheers!

So not just me. Raised a ticket, maybe there's some delay from Paradox getting the keys to GOG.

Hi dear players.

Could you explain to me what is this talk about codes?
Are DLCs supposed to have some kind of serial for activation on the Paradox Plaza and where can I find them?

Cheers.

Edit; Just found them. They can be found exclusively, through the browser based store.
GOG Galaxy does not include the section they are under. Indeed the key-code for the Ancient Relics DLC is missing.

Hi ussnorway.

Yes I figured that yesterday!
I took all the Stellaris product keys of my GOG.com account and activated them on my Paradox account. While doing that, I saw Paradox's "advertisement" about the "Paradox Launcher", that using it allows you to download some of their games (only four (4) for now) and keep them updated, straight from Paradox.
Gave it a try as well. Once they add more of their games it's going to be quite good, since being able to download my HOI4 Steam copy straight from Paradox (f*ck Steam D.R.M.) will be awesome. But unfortunately it seems that it will take them a while.
The "account linking" applies only to Steam users. GOG.com users just need to manually activate their provided keys (which I prefer by far to account linking) at their Paradox account.
Thank you for your reply, anyways, and I hope we get those sweet keys for the latest Stellaris DLC soon!

Cheers.

GOG Support is looking into it, they say some problem on their end.

Hi dear Stellaris fans.

The serial key for the latest Stellaris DLC, "Ancient Relics", is now available for those who have purchased it and can be found through the browser based, GOG.com site.

Cheers.

Confirmed and thanks