: Enemy Within is the major expansion for XCOM: Enemy Unknown . It adds new soldier abilities (MEC Troopers and Gene Mods), new mission types, and the human antagonist faction known as EXALT.

: Files named with "part1.rar" usually indicate a split archive . This means the full game installer was too large for a single upload and has been divided into multiple pieces (Part 1, Part 2, etc.). Technical Guide for Compressed Game Files

: Apun Ka Games is a third-party site. Always ensure your antivirus is active when handling files from such sources, as they are not officially verified by the game's developers (Firaxis Games) or publisher (2K).

The software will automatically pull data from the subsequent parts to reconstruct the full installer. : OS : Windows Vista or later. Processor : 2 GHz Dual Core. Memory : 2 GB RAM.

Right-click and select "Extract Here" using software like WinRAR or 7-Zip.