To download and run on a modern PC, you should use the OpenXcom engine , as the original 1994 release has significant bugs and compatibility issues with modern Windows. 1. Purchase and Download the Base Game
XCOM UFO Defense: Walkthrough/Strategy Guide - Steam Community
: Visit the OpenXcom website and download the latest "Nightly" or "Extended" version for Windows. X-COM: UFO Defense Download PC Game
You must own the original game files because OpenXcom requires them to run.
: You can buy X-COM: UFO Defense at the Steam Store for approximately $4.99. To download and run on a modern PC,
OpenXcom is a community-driven open-source clone that fixes game-breaking bugs (like the difficulty reset bug) and adds modern features like high resolution and scaling.
: Navigate to your original game's installation folder (e.g., SteamLibrary\steamapps\common\XCom UFO Defense\XCOM ). Copy the following folders into the /UFO/ subfolder of your new OpenXcom directory: You must own the original game files because
: The GOG.com version often costs around $5.99 and is DRM-free, making it very easy to move files.