While there isn't a single official "Bus Mod version 1.15.1," this specific version number typically refers to a stable legacy build of Euro Truck Simulator 2
Before we link the files, a quick note on stability. Version 1.15.1 was the gold standard for mod stability before the massive Scandinavia DLC changed the map sectors. For bus mods, this means we rely heavily on the older base and the classic Bus Traffic Pack by Jazzycat (v1.5 era). euro truck simulator 2 bus mod version 1.15.1