Suggested variation of script in BSE answer

duplicate_objects_along_curve.py

# script variation for https://blender.stackexchange.com/a/142495/935

import bpy

skull = bpy.data.objects["Skull"]
curve = bpy.data.objects["xobject_name"]

if 'Skulls' not in bpy.data.collections:
    newCol = bpy.data.collections.new('Skulls')
    bpy.context.scene.collection.children.link(newCol)

skull_Col = bpy.data.collections['Skulls']

for index, point in enumerate(curve.data.splines[0].points):
    if (index % 2 == 0):
        new_skull = skull.copy()
        new_skull.data = skull.data
        skull_Col.objects.link(new_skull)
        new_skull.location = point.co[:-1]