The method you are referring to is no longer supported. That team, however, has created an extension that does the same thing and is fully supported. I would reach out to Tamas Foldi or the Starschema team at firstname.lastname@example.org. They will be able to help you out with their current version of the extension.
without trying it out my quick hack would be to change this line:
this.ariaText.text( Math.floor(secondsLeft / 60) + 1);