This script adds up the chromium/chrome version and the extension ID you enter to quickly spit out the complete url to download the wanted crx file. I made this script to help me get extensions I want on ungoogled-chromium without having to constantly edit the url. Just a heads up, I am somewhat inexperienced in Python.

get-crx-url.py

# The script is written like this to allow Python2.7-Python3.x to run it. Feel free to make any improvements or changes

try:
    VERSION = raw_input('Enter chromium version: ')
    EXT_ID = raw_input('Enter extension ID: ')
  
    CRX_URL = "https://clients2.google.com/service/update2/crx?response=redirect&acceptformat=crx2,crx3&prodversion=" + VERSION + "&x=id%3D" + EXT_ID + "%26installsource%3Dondemand%26uc"
    
    print(CRX_URL)
except:
    VERSION = input('Enter chromium version: ')
    EXT_ID = input('Enter extension ID: ')

    CRX_URL = "https://clients2.google.com/service/update2/crx?response=redirect&acceptformat=crx2,crx3&prodversion=" + VERSION + "&x=id%3D" + EXT_ID + "%26installsource%3Dondemand%26uc"

    print(CRX_URL)