Based on my previous script of a nearly identical title, this script will snag the 2014 dotNetConf videos (high quality MP4s) from Channel 9. Change the $baseLocation to a folder of your choosing, and let it go.
Channel 9 PowerShell Download Script for Build 2014 Videos
Crazy long title, but you get the idea. Here is a PowerShell script that will download all of the mp4 high quality videos from Channel 9 for Build 2014. Change the $baseLocation to a folder of your choosing, and let it go.