This is the new reality.
Right-click that game. Go to Properties > DLC. You are looking for "Counter-Strike 2 - Full Game." how to download counter-strike 2
Go to Steam > Settings > Downloads. If you are on the East Coast US, switch to "US - New York" or "US - Chicago." If you are in Europe, avoid Luxembourg (always overloaded). The CS2 depot is massive. Using a less congested server can cut your download time from 3 hours to 45 minutes. This is the new reality
But with Counter-Strike 2 , Valve did something unprecedented. They didn't just release a game; they performed a hostile takeover of your library. You are looking for "Counter-Strike 2 - Full Game
Here is the philosophical and practical guide to downloading the most important competitive shooter in a decade. If you are looking for a store page labeled Counter-Strike 2 , you will not find it. This is the first psychological hurdle.