open terminal or cmd and run gb-dl.py
Enter course url , email and password when prompted. OR
run gb-dl -f FILE to load multiple course urls from files
run gb-dl -h for help

pip install gb-dl

Then get your key here : https://bmc.xyz/l/gbdl 
N.B key will be sent to your email.
 

https://stackskills.com/courses/enrolled/68582

 Download only a specified section of the course
 Download an only a specified range of sections
 Show course info without downloading
 Added cookie authentication 
 Downloading multiple courses from a file
 Load cookie from a text file
 Store cookies for future use
 Auto load/detect stored cookie
 Auto load cookie from a browser (firefox)