How change the character?

Hello,
I bought an new character from asset store and I want to put it with same animations & positions.
I can’t do that, can you help me, please?

Check this out: Imgur: The magic of the Internet

(Click on Next for other screens)

You don’t change just the mesh, you need to change the entire model.

Thanks for your replay.
May you tell me how can I do that to keep same animations, please?

Read up on mecanim.