You need:
- Unreal Engine 4.19.X (Found in Epic Launcher)
- Converter to a .pak file when you are done
- UE Viewer for extracting everything out of the game
- .psk and .psa importer for blender to edit the models
- Blender 2.80 for editing the meshes
Export your mesh as .FBX file so you can throw it in Unreal Engine