Hello! Thank you for your purchase.
The animations are in the fbx files. If you open them in Blender you will see that they work normally.
Maybe it's some configuration that needs to be done depending on the game engine you're using.
You can try importing into Blender and exporting in another format, or look on Youtube how to configure FBX file animations in the game engine you are using.
I only work with Unity for 3D games so unfortunately I won't be able to help you with that, sorry.