Vertex Animation Toolset, crowd rendering

I Wonder how can i figure out the value about Override Size Vert/Bone and the NumFrames

Hello you all.

Cannot make VAT work anymore on 4.27 with Vertex Anim Toolset, would love to make the UE5 Anim To Texture work but cannot find any documentation on how to export the anim data textures + Skeletal Mesh.
Anyone has a clue?

Thanks in advance, Jonathan