Run this script gives an error:
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 1882k 100 1882k 0 0 5473k 0 --:--:-- --:--:-- --:--:-- 5488k
ERROR: This script does not work on Python 2.7 The minimum supported Python version is 3.6. Please use https://bootstrap.pypa.io/2.7/get-pip.py instead.
So pypa.io had moved this script, after update url script works.