pip install chd

chd url [-p path] [-s start_lesson] [-e end_lesson] [-v]

positional arguments:
url                       course url

optional arguments:
-h, --help                show this help message and exit
-p PATH, --path PATH      download path, default is <course-name>
-s START, --start START   the lesson number from which to start the download

-e END, --end END         the lesson number at which the download will be
                          completed
-v, --version             print version information and exit