This video by Chris Gaynor shows an easy way to update a Premium WordPress theme. The video has some rather distracting background noise for brief periods and a steady low sound that lasts the whole video.
I do not tell you this to discourage you from watching this informative video. I simply want to warn you in advance about what some might find distracting or worse.
The video is published on the authors site http://chris-gaynor.com. The information presented in this video is quite accurate and if it were not for the poor sound quality the video would be nearly perfect.