: You can purchase the Stronghold Crusader HD Pack which includes both the HD update and the "Extreme" version.
Why is the superior for skirmish? Because the AI is at its smartest. Here are the top lords to challenge: Stronghold Crusader 1.3 Download Full Version
If you still have your old CD-ROM, you will likely need to apply the patch manually. : You can purchase the Stronghold Crusader HD
: The 1.3 and subsequent patches (like 1.41) are standard for the Stronghold Crusader HD version available on Steam. Stronghold Crusader 1.3 Download Full Version