def METHOD_NAME(self, version):
    url = "https://github.com/CGAL/cgal/releases/download/"
    if version <= Version("5.0.3"):
        url += "releases/CGAL-{0}/CGAL-{0}.tar.xz"
    else:
        url += "v{0}/CGAL-{0}.tar.xz"
    return url.format(version)