Old version Anim to New version Anim

So I’m using the MMO Starter Kit. On this kit the model is the HERO_TTP which I believe is the old model used. The current version, 4.10, uses the SK_Mannequin.

The problem is that when I try to migrate the SK_Mannequin (even by remaking the skeleton when importing?) for some reason, the model itself is good, but when I transfer over the animations (lets say the Idle.fbx) the arms and few other bones are not where they should be.

any ideas on how to fix this?

Regards and thanks!

I downloaded the AnimStarter Pack and added it. From there I used the skeleton which is working fine now, even with my other fbxs that I added.