Just in case.

Are you seeing this (see attachment)?

It's really weird that this happen, it's the first case I hear of somebody that lost the game after they purchase it on a legal store, this often happen with game purchase on shady grey market site.
Now, let's try to solve the problem, do you have a recipt on you orders and settings tab (https://www.gog.com/en/account/settings/orders) there it should appear your history. If doesn't appear, then check your mail, as a first party code you should have recived a mail with the ticket.
If that's neither the case, then you should contact the blues. I already send this tread to somebody to see if can do something.

GOG says you own one game. You've insinuated that you only have this account for this one game, and your profile says you own exactly one game. Hence your game is still in your library. You don't need step 2 anymore. Skip to step 5.

Yes. But I said before, i cant see this game my library.

Is your Cyberpunk order/receipt listed here: https://www.gog.com/en/account/settings/orders

We need to get a few things clear.

You bought the game on disc for the PC.
1. Did you register (redeem) the game online with a GOG account at the time? Your wording makes this unclear.

This would have required you either already had a GOG account or created one.
It would have also required the input of the code that came with your boxed version, to register (redeem) it.

If so, then the game should have appeared at that time in your GOG library.
It is also likely you would have received an email confirmation of this.

NOTE - You can only register (redeem) the game once. So if you did it back when you bought it, you cannot do so again.

2. Are you using the same email address now, as you did back then?

3. Did you ever give the Redeem code to anyone else?

Ok, one final attempt.
When you go to your "Orders & Settings", under "Orders History"...you should see Cyberpunk 2077 listed.

It should look somewhat like my attachment.

Apart from that, you should have an email saved in your email account (you save your GOG receipts, don't you?) from GOG confirming the addition of an item to your account.
("(free) items added to your GOG.com library" is the exact wording, I believe)

If your statements so far are correct (bought the game as retail in a brick and mortar store, redeemed the key in 2020 already, downloaded and installed the game successfully in the past, etc) you should be able to clear stuff with GOG support easily - simply add the receipts mentioned before (as screenshots/copy-pastings) to your message to the support team.

We here, as fellow customers, are at the end of our possibilities to help you.

1: I redeem my code in browser. Yes i bought the game on disc. Legal store etc.
I download without GOG Client, But after dowload the client because very bugging the offline install.

Sorry but i cant remember that 2 year ago, have appeared GOG library. But i think, this game add my library like a "Other game".

"You can only register (redeem) the game once. So if you did it back when you bought it, you cannot do so again."- thx i know. But the game not in my library.


2: I have 2 email address. Checked, but 1 registered and a 1 unregistred in GOG. I think that's not the problem.

3. No one has seen my code.

I don't know how many more times I have to write that I'm writing here because I don't have the game in my library. It's no use writing it down 100 times. I'm not far from that yet. I'm not stupid. I don't want to redeem a cracked code. It's no use writing so that I can look at it here and there. I'm writing because wherever I look, the game doesn't appear. Not in the library, not in the history. Before someone writes: it is not among the redeemed codes, neither on the page nor in the program.

Where should I top up the bill? The chatbot is unusable. I get an unusable reply to the gog support email address, with a link which, if you click on it, redirects you to the main page. This forum post is my only chance because gog is unavailable elsewhere. But I won't post the picture here for obvious reasons.

The image upload does not work on the page either. Very funny moments.
Below-critical performance compared to such a large company (Latest Chrome, win10)

You could also check your email.

We all understand you very well.
But we can't help you here.

You say you only have this one account, you say with this very account, you redeemed your valid code, it got accepted, you installed the game...and now it's gone - without a single trace.

GOG support is where you want to take your problem.
We tried our best - you don't appreciate that.
That's ok.

Try this instead: https://support.gog.com/hc/en-us/requests/new?product=gog

As chance would have it, I contacted GOG support 11 days ago (over the above link).
Got a confirmation email the very next day, that my request for help was received.
Today my request got fulfilled.

Had no problem adding a screenshot to my request.
Win 10/ MS Edge (latest version)