I saw Arma II advertised in the installation screen of GRID. But when I clicked on it, the game no longer exists. What happened?

It has been gone of GOG for a while now.

Bohemia Interactive removed all its games from the GOG catalog 2 years ago. I hope it will come back one day !

Shutdown of multiplayer service Gamespy happened. Arma II used it for multiplayer.
Now they switched to Valve's Steamworks.

https://forums.bistudio.com/topic/168710-gogcom-removal/

the installers dont fetch their "ads" fromt he internet
the ads are part of the installer and since gog doesnt always update them to remove outdated ads you still get ads for games that are not here anymore

I'm still sore at them for pulling Original War as well. A game that was really only maintained by fans at that point. Bohemia might as well just have said: "We're assholes like that. Deal with it!" I love piss-poor excuses for decisions made.

They're also the only publisher to ever pull their games from GOG of their own volition. That says more than enough.

Mastodon, the American heavy metal band from Atlanta, Georgia?

Those Bohemian rascals. My goodness. Maybe they will have a change of heart. LOL

I think it's a clue, Oblivion confirmed!!!

OBLIVION!!!1