You did not include the model in the project that has the animations. So, I can't change what you included as part of your product you are selling.
Viewing post in Godot 4 Third Person Ladder Project comments
If you want to use the existing animation with your own model, you can import the model(A-pose) and retarget the skeleton. Then, just add the animation library(check Animlib folder) into animationplayer. If you have any problem in retargeting animation in godot, i suggest to check the godot documentation first.