download videos, ppt and text files from webpage

IN PROGRESS
Bids
3
Avg Bid (USD)
$150
Project Budget (USD)
$30 - $250

Project Description:
I would like to download for offline viewing all the videos, ppt and text files related to a course hosted on coursera

Each course has a different URL to start but the same basic structure.

eg
https://www.coursera.org/modelthinking/auth/welcome
or
https://www.coursera.org/saas/auth/welcome

click "signup/login with Coursera Account"

Enter Credentials
Email address
Password

click Login

Now directed to a class overview page. Left hand side has navigation

click Video Lectures

Now page shows a list of lectures.
I would like to download all the PPT, TXT and Video files
There should be the following directory structure to save the files

Lecture series header
----Lecture Name
--------PPT, TXT and video files

eg for the first course above
"Introduction: Why Model/Why Model/why model slides.ppt"
"Introduction: Why Model/Why Model/subtitles.txt"
"Introduction: Why Model/Why Model/download.mp4"

Skills required:
PHP
About the employer:
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