Fixes 10 critical crash bugs ++ 6 networked multiplayer bugs ++ About 30 interface bugs ++ Over 100 game-rule bugs.
Play against a random number of opponents ++ Play with auto designed ships ++ 6th ship design slot ++ Greatly improved build queue management ++ Unbuy function ++ New hotkeys.
1.50 improved ++ ICE 27 ++ VDC ++ Version 1.2 mod ++ Melee ++ Lots of mapmods ++ A standard mode is available, which is purely the patch, no mods.
Integrated mapgen functionality ++ Modding with plain text configuration files ++ Lua scripting support.
Supports English, German, French, Spanish and Italian DOS editions of MOO2. ++ Installing the 1.50 patch does not break your current version 1.31 or 1.40 installation. No original files are overwritten.
Multilingual version 220.127.116.11 patch
1.50 fan patch. February 6, 2021. 10471 kB.
Development of the 1.50 patch for Master of Orion II: Battle at Antares started in the last quarter of 2015 and the first version, 1.50.0, was released February 6, 2016. Currently the patch stands at version 18.104.22.168. Development is still ongoing and a version 1.50.19 is in the works.
English version 1.40b25 patch
Updated 1.40 fan patch. November 9, 2020. 1178 kB.
The English DOS version sold online is fan patch 1.40b23 from May 2006. Information about this patch can be found in Lord Brazen's 1.40 patch FAQ. The 1.40b25 version is what I use for testing with the 1.40 patch. It has 4 changes compared to b23: Screen fade-ins and fade-outs are faster; Tactical Combat is turned on by default in the Game Setup screen; missiles default to x2 shot racks instead of x5 in the Design Dock console; and the cheat ALT+menlo gives 30.000 instead of 9.999 research points. The zip file includes a changelog and the source code of the 1.40 patch.
In case you do not want to play a fan patch you can revert from 1.40b23 to the last official patch as follows: Download English version 1.31 patch (below), extract the file "ORION2.EXE" from the zip file and copy it into your MOO2 directory.
English version 1.31 patch
Last Microprose patch. April 11, 1997. 3350 kB.
German version 1.31 patch
Last Microprose patch. April 11, 1997. 2342 kB.
There are no patches for the French, Spanish and Italian editions because they already released at version 1.31.
The default mod of the 1.50 patch. Introduces new combat mechanics like Ship Initiative 2.0 and also makes a number of tweaks to weapons and special systems. Special care was given to improve AI ships designs. The Excel manual included with the download explains it all. Race picks & Tech Tree are unchanged from Classic.
Version 1.2 mod
This little mod approximates MOO2 version 1.2 as close as possible with current 1.50 config: Creative costs 6 picks again, Psilon race design restored, original Guardian and Antaran ship designs, Plasma Cannon, Ion Cannon and Gyro Destabilizer weapon stats set back to original values!
Extensive mod that makes the AI more challenging. This mod changes race picks & the Tech Tree too. The difference between ICE-M and ICE-X is the AI strength: ICE-X Impossible has the strongest AI, you'd better know what you are doing!
ICE-F is a mod-of-the-mod by Dirtbag. It's used for multiplayer.
ICE-XM is a mod-of-the-mod by Pendra37. It's got a random tech tree.
Link to a mod by Depth386 for the 1.50 patch.
No AI surrender micromod
Prevents AI from surrendering before turn 1000. Unzip and place config file in 150\mods\150, then restart MOO2 Launcher.
Savegame Editor. 153 kB. Corion version 1.1.1 has been optimized for the 1.50 patch.
LBX editor suite by Grig de Griz. 2713 kB. Handles text, picture and font files. Includes a leader editor.
Modding tool and game launcher by Ponkyo. Link to external page. Includes a tech tree editor.
O2M is not fully compatible with MOO2 Launcher. If you want to use both, then create 2 separate MOO2 game directories, one for each launcher.