Are the mannequin model with IKs available for animation?

Are the mannequin model with IKs available for animation? I want to try to add some animations to the first person and third person mannequins. I tried to export the models, but the skeletons you get from that aren’t animation friendly. Are the source models available somewhere? I don’t have Maya, is that a problem?

You can animate the models in whatever program you have available that can import .fbx models. The third person mannequin model can be downloaded from here:
https://s3.amazonaws.com/unrealengine/marketplace_samples/SK_Mannequin.fbx

Thank you!