Seems download dialog-box is not a DOM , thus
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
dr = webdriver.Ie(executable_path="IE.exe")
# EXAMPLE -- download ZIP Jun 20,2018
dr.get('https://usda.library.cornell.edu/concern/publications/j098zb09z?locale=en')
download_CSV =driver.dr.dr.find_element_by_css_selector('#j6731631h > div').click()
# Find the download dialog-box and click save but no function in python selenium.
How to apply these function in python through what kind of library ?
using System.Windows.Forms;
SendKeys.SendWait(@"C:\Users\Public\Pictures\Sample Pictures\Dock.jpg");
SendKeys.SendWait(@"{Enter}");
Explanation from CheryJose clearly tell dialog-box is not one of the DOM
Selenium Web Driver Cancelling Firefox Downloads
How to combine with those script in Python ? to control the download dialog-box -- these dir & click OK