Make sure you have the Kingdoms Launcher to add them and also to update the M2 launcher (see:
http://forums.steampowered.com/forum....php?t=2500705).
1. For King or Country - M2 (follow installation instructions as given. Add by using Kingdoms launcher. It works for me)
2. La Guerre de Cent Ans - The Hundred Years War - M2
3. Chivalry II: The Sicilian Vespers - Kingdoms (follow installation instructions as given)
4. Rule Britannia (RB)
5. 1648 (if you like 30 years war mods. Although it's not really finished yet, it's beta works)
6. With Fire & Sword (another 30 years war mod, if can read Russian. It does have a limited English patch, but the patch may have be responsible for ctds)
7. Stainless Steel (forget what you've heard, this is good one. the economies are well balanced. The difficulty are these sudden events, like William Wallace popping up, but they a nice flavor to the game)
8. Bellum Crucis 6.3 (A Spanish mod. Very nicely done. Let the computer manage your economy or you'll go bankrupt in the first few turns)