I took a look and here’s what I would suggest doing. Download the current version of the theme from the downloads section here (there’s a button on the right hand side). Unzip the live.zip file that you’ll receive and rename the folder live-update and then zip it back up.
Then install the theme like you would a new theme by going to the Appearance section in your dashboard and choosing Themes.
That will give you the current version of the theme to work with.