I would recommend registering your copy and then updating Trinity to the latest versions, current version of Diplomacy is 1.34.

This is very stable, it is very, very unusual for the game to crash.

The diplomacy aspect comes into its own with larger maps, where there are more factions with more opportunities to form alliances against other faction(s).

It's easier to form alliances with a faction that is the same race as your own (racial inclination), however it is more useful to form alliances with other races as you can share each other's pacts.

These pacts can provide a significant boost to your empire & fleet, so I would say Diplomacy is well worth it.

He already bought it. He wants to know how he can make it stop mindumping.

I got news for you, 1.34 will still minidump, and quite a bit!

Delete your "Ironclad Games" folder. located in C:\Users\"Your User name"\AppData\Local\. "Your User Name" is the name you use to log into windows.

Be sure to back up any mods, saved games, and screenshots before you do this.

What this will do is delete any old incompatible settings, and config files that could cause problems. When you run the game after deleting the ironclad games folder, Sins will automatically create a new Ironclad Games folder with the correct files and subfolders. You will have to redo your settings, and options, but this should fix your problem. If you still dump then you may want to consider a clean re-install of Sins.

To cause you.... some Major Stress. 

I thought all the Diplomacy only players died.

 Diplomacy is a great game after you mod out superweapons.  But personally I like Sword of the stars II better.