Changing character mesh and animation line trace stopped working and ragdoll

I have changed the default character with the Infinity blade : Warrior characters on market place and now the ragdoll of my main character with set physics doesn’t work anymore also the line trace of the AI doesn’t hit my character anymore… If a change the mesh of the character to the default one everything work fine.
Anyone know what is going on here?

As I can see there in no physics asset for the infinity blade : warrior… can I create one inside unreal editor?

Add new>physics>Physics asset and voila!