To apply the autosplitter:

1. In LiveSplit, Right click, go to Edit Layout
2. Click on the plus button, select Control --> Scriptable Auto Splitter (position in the layout doesn't matter)
3. Double click Scriptable Auto Splitter and select where the script is located (it's good to have a folder for splitters)

In the settings, you can choose at which points in the run you want the timer to split.