Translation: Due to our deliberate decision to introduce online activation to our game - you have to visit this website to activate your copy, we must delay DRM-free release on GOG.

The most DRM any Daedalic game ever had was Night of the Rabbit and it could be seen as an homage to classic copy protection measures. They even managed to have you use this each time you start up a game.

Now this? Bye-bye Daedalic, 't was nice to know you. Keep your games and pay undivided attention to where money and felt protection lies: Steam.

Fun fact: The game was out a day after they released it on Steam. Go figure the level of added protection they introduce to their games. Goes a long way reading how even Steam customers oppose this step. But, well, let fools be fooled and fool themselves, I guess? ;-)

Here is all you need to know in a nutshell:

They released a DLC and a patch for the game on Steam, they haven't removed the online activation the game has bugs, the developer's website is in-development since forever and Daedalic obviously doesn't care.

This is why I would suggest to you to stop wasting time on this. If they don't care, which obviously they don't, you should also not waste any money on their games.

Ah, didn't know about the DLC, thanks for the pointer.

Well, they finally released it on GOG now. Still pissed about the rudeness of not getting replies through the various means I tried to contact them and the price is obviously silly (historical low for the steam release of the extended edition was 15,72€, on GOG it's 30) so I'll wait.

Edit: And this wasn't a one-off ages ago. It's been <20€ eight times on steam, most recently less than 2 weeks ago. Pretty sure it was also part of a humble choice but don't quote me on that.