My friend Yaram has created an autosplitter for versions 1.11.2 and 1.12.1, which is now available through LiveSplit or via her Github.

Any info on how to load it? I downloaded the file, added it to my layout and checked the boxes for when to start and when to split. Doesn't seem to work.

Zapall It currently only works for versions 1.11.2 and 1.12.1. Your LiveSplit needs to be running Administrator Mode for autosplits to work. If that also doesnt work try acquiring it through the LiveSplit app by going to Edit Splits > Typing OpenTTD in the Game Name > Activating the AutoSplitter that appears by Yaram.