: Available for $9.99 as a standalone expansion. Note that it requires the base game, XCOM: Enemy Unknown, to play.
If you do not have Prime, you can purchase the game from these authorized retailers: xcom-enemy-within-pc-game-full-version-free-download
XCOM: Enemy Within is not legally available as a free download for PC; it is a paid expansion for the base game, . However, you can currently get the XCOM: Enemy Unknown Complete Pack (which includes the Enemy Within expansion) for free if you have an active Amazon Prime subscription via Prime Gaming until July 1, 2026. Official Purchase Options : Available for $9
: NVIDIA GeForce 8600 GT / ATI Radeon HD 2600 XT or better Storage : 20 GB available space XCOM: Enemy Within on Steam XCOM: Enemy Unknown