It’s been nearly eight and a half years since a totally new component was added to Unfinished Business, but that streak is at an end! Kulyok has adapted the original design notes for the Murder of Acton Balthis into a full subplot for Haer’Dalis, and you’ll find it in the new Unfinished Business v20.
In addition, several long-standing bugs have been corrected in several quests, and translations into German, Russian, and Polish have been improved and updated. The latest edition of this legendary mod is available here.