As I do every time when a major Microsoft event happens somewhere in the world, the first thing I look up on the internet after the first day of the event is a script that will allow me to download all sessions’ recordings. Build 2015 and Ignite 2015 are no exceptions, as of the second day of the Ignite conference, Michel de Rooij put up his own downloader PowerShell script on the Technet Gallery. All credits go to Michel!
https://gallery.technet.microsoft.com/Channel9-Session-04b2558b