Available formats: .blend, .obj, .3ds, .fbx, .dae
Four texture sets are available :
Though I am not sure that normal map will work perfectly for UE4. I just exported it from Substance Painter using UE4 preset.
High and Low poly fbx is available in High_And_Low folder. Size do not mach to the rest files and twigs is in different position, but it will work for purposes of rebaking and texturing.