Players who own the game on older consoles (PS4/Xbox One) can download the Gen 9 update for PS5 and Xbox Series X|S at no extra cost.
Sandstorm: “Operation: Overrun,” New Major Update Now Available operation-sandstorm-pc-game-free-download-full-version
The game you are likely referring to is , a tactical team-based first-person shooter. While the game itself is typically a paid title, it frequently offers free content updates —often titled "Operations"—to all owners of the base game. Understanding "Free" Availability Players who own the game on older consoles
The full version is generally a paid product available on Steam and other digital storefronts. operation-sandstorm-pc-game-free-download-full-version
It is important to distinguish between free updates and the full game download: