Just FYI, It’s being given away on GOG’s home page. You may claim your own free copy there if you so wished (for a limited time)

Not in Russia, if I'm not mistaken.

Thanks for the information. Unfortunately, at the moment, with the Russian language enabled, the main page looks like this (screenshot 1), when you click on the Learn more button, an error occurs (screenshot 2). When switching to English, it looks like this (screenshot 3), when you click on the button, it redirects to the promotion page (screenshot 4). When I try to open the game page in the store, I am redirected to the main page of the store. Maybe I don't understand something or I'm doing something wrong? Then correct me please. Maybe it's a bug? Since I can't buy or take this game for free, I asked for it as a gift, according to the rules of this thread. Sorry if I did something wrong.

You do not need to click "learn more".
Scroll main page down a little and there should be a banner with Sanitarium giveaway.

Thank you for the additional information. I tried several times to scroll through the main page in both Mozilla and Chrome, but I did not see such a banner (attached screenshots). Maybe I'm looking in the wrong place?

Can you see the Sanitarium banner on this snapshot?

https://web.archive.org/web/20220606183659/https://www.gog.com/

Note: it seems that you need to copy-paste the whole link text, as the click links only to actual gog.com main page.

It's between two sections: "Flash deals" and "Featured deals".

Do you use and extensions in your browser? If you do not then maybe indeed it's blocked in Russia.

The giveaway is blocked in Russia. Probably part of GOG's ban on Russia. If one's country is set to Russia, Sanitarium doesn't even appear in GOG's catalogue.

Don't sweat it. I expect Lone_Scout will grant your request.

Yes, I see a banner through the web archive (screenshots 10). I tried to enable safe mode in the browser - it did not help. Most likely, this is still a bug or a block according to the host country. Thank you very much for participating and trying to help, Lexor!
Thank you for participating, mrkgnao! Thanks to the post in this thread, a kind person wrote me a personal message and presented this game. Thank you argamasa. I edited my original post in this thread with a game request so as not to mislead Lone_Scout.

Weird enough.
I just realized that, not sure since when but, that game doesn’t appear in my catalogue anymore either, yet somehow I did manage to receive it last night. Well, maybe it’s a pure region lock or something in my case, if that makes any difference...

EDIT: for what it’s worth, Sanitarium’s back to the catalogue now for me. Not sure if this is the same case for Tim_Fey though.

For several months I had been seeing all kinds of weird things on GOG.com too, not until last month did most functions recover. It would seem to me that GOG’s always busy doing some behind-the-scene changes here and there about their website over these years, so if this turns out to be some kind of bug, I won’t be surprised.
Anyway, I guess yours is a perfect case to request a key though;)

I missed the GA. Sanitarium please?

... I'd say that nobody can complain about not noticing that there's a nomination for an entry now...

I see there are still 25 (!) keys for Deadlight. It's a pretty good but very short game, come on, give it a try!

Granted.
Granted.