Yes, definitely this plugin, and I already sent you the link.
And by the way, yes, one skeleton is definitely not enough to create an animation. Well, it's not enough to create a decent animation.
Added 2 minutes later
By the way, footman wanted to ask you if there is any universal way to adapt the animation to Heroes 5. That is, are there any universal values for the distance the model needs to be moved and the length of the frames? Or does it always require improvisation and adaptation?