npm install -g https://github.com/alekseylovchikov/ch-download
coursehunters -u course-url [-d dirname] [-l lessons] [-e email] [-p password]
-e: email for login
-p: password for login
-u, --url: https://coursehunters.net/course_name
-d, --dir: download folder, default <course_name>
-l, --lessons: download only listed lessons, e.g.: "1-5, 7, 10, 12-15" or 3-7,9,11,15-20