So I just bought the game on cdkeys.com, and I managed to redeem it on gog. But I get these errors when trying to download/install

{
"error": "invalid_licence",
"error_description": "User #51281157992621975 does not have the license for product #1423049311."
}

Any ideas?

not an authorized reseller. Probably sold you an illegal key. Go to them for a refund.

Alright. I'll contact them for a refund and buy it directly from gog instead. Thanks

I was having this a few minutes ago with a few games I'd just bought direct from GOG but seems sorted now.
The games purchased where in my library but was getting the same error as you and the store pages still said 'buy now'. All fine now thought.
I assumed was just a bit delayed due to the sale just launching.

Yeah it works now. I got two copies. Had to make a new user aswell in order to buy it.