The latest version of the sketch (TinyISP) can be downloaded from here...
https://github.com/Coding-Badly/TinyISP/zipball/master
Or, the source can be browsed here...
As published, it is a drop-in replacement for the ArduinoISP sketch. Please download it and try it. At this point, the only noticeable difference should be shorter upload times. I will add more instructions later (probably tonight).