BSoD/Character Animation/Lower body armature


I’ve just started learning Blender, worked with Maya and 3Ds Max but now I have some spare time to finaly learn Blender. Going great with this tutorial regardless that the versions don’t line up. This has given me some troubles along the way, but managed to fix them. I’m working on this tutorial:

But now I’m really stuck. Done everything the way it told me but… the button IK Solver is gone in version Blender 2.68a. This became Spline IK, I think. But when I add this constraint I can’t add armature to the Spline IK. What am I doing wrong?

Hope there is someone that would have some time to help me.
If it would help, my file is here:
I’m working on the left leg and stopped where it went wrong.

Best regards, SlwR