Sorry for the late response.
The only place I know to get the Vitamin M back catalog is this YouTube channel:https://www.youtube.com/playlist?list=P ... fCQHX0oV8y
problem being it starts in 2016 or just before it.
Prior to that, there was the From Everywhere podcast. It ran from 2011 to 2015 so that's probably what you want to look for.
It's available on iTunes apparently:https://itunes.apple.com/jp/podcast/%E5 ... 24453?mt=2
There are ways to obtain both series as downloads but nothing official I'm aware of so can't share where/how to obtain it.