Freeing Captured Faction Leaders

[Ajantaka]

I am using the 2.0 patch.

I seem to remember from long ago that it is possible to do this (free the leader of a faction that was eliminated).  Was the process to go to the main base of the faction holding the captive and launch a probe team operation?  When a faction eliminates another does it always keep the leader prisoner, or only sometimes?  When I eliminated a faction in my current game I was given no option to kill or keep the leader.  Why not? 

Do I not have the correct patch in order to do these things?  What is the most up to date patch?

Thanks

[gwillybj]

If you have the "Do or Die" option checked at the game setup, eradicated factions are permanently eliminated.
Turn this off in your next game if you want to be able to free captured leaders.

[Seleuceia]

Let's say faction A conquers faction B....IIRC, you have to probe the headquarters of faction A (so the HQ of the conqueror, not the conquered)...you get unique probe options at the headquarters, freeing faction leaders and assassinating researchers being the two that I remember...