Thanks so much for making this great tool. I can't get it to work though. I downloaded the 3.0 version from the opening post (which says its the latest version). No matter what folder i put it in it says it can't find any EDU file and creates a new blank one on the desktop. Also when i multiply unit costs by 0.5 (to halve them) it tells me its increased them by 0.5 (i.e multiplied them by 1.5). I'm on Windows 7.
Is it possible you've uploaded one of the earlier versions by mistake?