One of the problems of developing an application is that you live with it for years and it is very difficult to see it through the eyes of a newcomer. Doubtless that is true of my application too
Accordingly, you could consider recruiting a team of average programmers to try out the package (not expert programmers) while you watch - I suspect you would be surprised at the problems they encounter. I think I have it just about sussed out now but Advanced Installer is so huge that it is easy to get baffled and not realise the cross links (you change A and that means you need to change B or possibly AI will do it for you)
Another possibility is a one day course in major cities eg London, New York, LA etc. I would attend a course in London. You could then offset the course charge against purchase of a package ...