IMPORTANT
OpenXcom requires a vanilla copy of one of the following:
- UFO: Enemy Unknown / X-COM: UFO Defense
- X-COM: Terror from the Deep
Do not use modded versions (XcomUtil etc). Other games are not supported. If you don’t own a copy, you can buy it from one of these retailers.
Check the Installation documentation for more details.
A new milestone is coming soon! Use the latest nightly instead.