Get the Imperial Assault Campaign module for Vassal from http://www.vassalengine.org/wiki/Module:Star_Wars:_Imperial_Assault
The next Total Solar Eclipse holiday in 2024 in USA? See you there!
This pack is part of a a reinforcement wave. Only core set tiles are used in both the skirmish and campaign map. (All reinforcement waves only need the core set tiles, with the Bantha Rider being the exception.)