I bought the game from humble bundle for GOG. It shows in my GOG order history that I bought the game. The game does show up in my collections on the GOG website. But the game does not show up in my library in the GOG launcher.

I clicked and download and install and it downloaded `GOG_Galaxy_Cyberpunk_2077.exe`

When I open it, it opens CP2077 on GOG, it takes me to the game's overview but it shows the Buy button.

Download it from your account, here.
https://www.gog.com/account

You don't need to bother with galaxy.

I know i got CP2077 in my library too, however that's only for the free 'goodies' (Same for the Witcher 3) they put out some weeks back.

If you can't get the game in your library see if it's only the goodies.

Also recently having gotten a free copy of Seven, it may be required that you have HB linked to GoG so they can activate the game directly (which will prevent key re-selling) and if you have not redeemed/activated it that way, see if you have to.

I did link GOG to my HB account. I even got an email from GOG saying "thank you for your purchase".