OpenXcom requires a vanilla version of the original UFO: Enemy Unknown / X-COM: UFO Defense (any edition) with the latest patch. It is not compatible with other games in the X-COM series. If you don’t own a copy, you can buy it from one of these retailers.

Do not use modded versions of X-COM, as they may be incompatible with OpenXcom.

Check the Installation documentation for more details.



These builds are automatically generated from the codebase, so they have the latest fixes and updates as well as the latest bugs. Use these if you wanna live on the bleeding edge or to check if a bug is obsolete.

Windows Mac OS X Ubuntu / Mint

Maintained by SupSuper

The installer is not included, so you have to copy the original Data yourself. For more details see the FAQ. Latest version is at the top and includes all previous versions:

SupSuper, Sat Aug 20 17:16:54 2016

SupSuper, Sat Aug 20 16:48:49 2016
More user-friendly errors

Daniel, Thu Aug 18 23:13:38 2016
Merge pull request #1115 from r4nd0m6uy/fix_werror

Fix werror
Guy Morand, Wed Aug 17 19:12:15 2016
fix -Werror=sign-compare

Guy Morand, Wed Aug 17 19:09:39 2016
fix -Werror=unused-variable

SupSuper, Thu Aug 18 23:12:42 2016
You win MinGW

Warboy1982, Thu Aug 18 23:06:35 2016
fix other calculation

SupSuper, Thu Aug 18 23:04:42 2016
Fix includes

SupSuper, Thu Aug 18 22:44:15 2016
Fix error messages in Git builds

Warboy1982, Thu Aug 18 17:51:03 2016
fix transposed numbers on mission timer delays

Warboy1982, Thu Aug 18 17:46:23 2016
fix oversight on base detection odds

Warboy1982, Thu Aug 18 10:48:14 2016
fix mission statistics wrongly reporting victories

Warboy1982, Tue Aug 16 12:23:32 2016
fix recovery of nav units from bases

Warboy1982, Sun Aug 14 05:27:51 2016
fix hobbes' frustration

Warboy1982, Fri Aug 12 18:57:41 2016
make alien base mission generation a weighted table

Warboy1982, Fri Aug 12 18:56:42 2016
fix marker icon indexing

SupSuper, Sun Aug 7 03:23:04 2016
More warnings

Mac OS X
Maintained by grrussel

Check this website for more details.

Ubuntu / Mint
Maintained by Krzysztof “Knapsu” Knapik

Available on a dedicated PPA repository. Please do the following in a terminal:

# sudo add-apt-repository ppa:knapsu/openxcom-beta
# sudo apt-get update
# sudo apt-get install openxcom