Download Google font files using this python script.

font-downloader.py

import requests
import os


def get_urls(content):
    '''
    Parses the css file and retrieves the font urls.

    Parameters: 
    content (string): The data which needs to be parsed for the font urls.

    Returns: 
    A list of urls.

    '''

    urls = []
    for i in range(len(content)):

        # read the content until you encounter url string
        # after you encounter the url string, scan the content until a closing parenthesis is encountered
        # store the fetched url in the urls list
        if content[i: i+3] == 'url':
            j = i + 4
            url = ''
            while content[j] != ')':
                url += content[j]
                j += 1
            urls.append(url)

    return urls


def fetch_data(urls):
    '''
    Downloads the font files from the `urls` list.

    Parameters: 
    urls (list): List of urls from which the font files have to be downloaded.

    Returns: 
    None

    '''

    # create a fonts directory if it doesn't exist
    if not os.path.exists('fonts'):
        os.mkdir('fonts')

    for index, url in enumerate(urls):

        # get the font's name from it url
        font_name = url.split('/')[-1]

        # download the font data from its url
        response = requests.get(url)

        # save the downloaded data to the font file
        with open(f'fonts/{font_name}', 'wb') as f:
            f.write(response.content)

        print(f'Downloaded {font_name}, {index + 1} of {len(urls)} fonts. ')

    return None


def main(method, src):
    '''
    Main Function for the app.

    Parameters: 
    method (string): Add link if the `src` is a HTTP/HTTPS link.
                     Add file if the `src` is a local CSS file.

    src (string):    Add the path of the link or the file, depending on the `method` parameter.

    Returns: 
    None

    '''

    if method == 'file':
        with open(src) as f:
            content = f.read()

    elif method == 'link':
        content = str(requests.get(src).content)

    # extract the urls from the content
    urls = get_urls(content)
    print(f'Fetched {len(urls)} urls.')

    # download the font files
    fetch_data(urls)

    return None

# uncomment the below method if src is an HTTP/HTTPS url
# main(method='link', src='https://fonts.googleapis.com/css?family=Rubik&display=swap')

# uncomment the below method if src is a local CSS file
# main(method='file', src='fonts.css')

Go to https://fonts.google.com and select the font of your choice. Select the styles you want to use. Then click on View your selected families on the top right corner. Choose embed option and copy the full URL starting from https://.

Download the above script on your machine. And paste the copied URL in the line#99 and run the following command

python font-downloader.py