You cannot buy a Steam key for this game anymore, as they are completely exhausted. You must look for an global activation code explicitly meant for the EA App.

In December 2021, Respawn Entertainment officially removed Titanfall 1 from sale on all digital platforms, including Steam and the EA App. By March 2022, they also removed the game from subscription services like EA Play. Why was it removed?

Search for or the Icepick mod to enable server browser functionality. 2. Check System Requirements

However, Respawn Entertainment officially delisted Titanfall 1 from all digital storefronts and removed it from subscription services. This makes finding a legitimate download link for PC highly challenging.