This is a chrome extension to install this extension download the source and use the developer mode to activate it.
Once this is done login to Pluralsight and go to your course. When you are looking at the player the Pluralsight icon should become active pressing this button will simulate the download process (aka log the mp4 urls to the plugin console).
Be aware that downloading anything from Pluralsight will make you break there Terms of use.
Since this is a proof of concept the line chrome.downloads.download({ url: msg.url, filename: msg.filename, conflictAction: "prompt" }); is not included in background.js on line 56.
This plugin is only a proof of concept and should not be used for piracy or any other none legal purposes