[davidfarquhar]

I would be happy to pay for the upgrade to this program. I don't think it should be as much as the original version, perhaps 50% or so?

However I understand there are infrastructure issues with setting up an upgrade price, even if you did it as a separate app. You could offer the new version / app as "50% off for the first 2 weeks" which then lets all of us existing users "upgrade", and then move it back to the normal price?

Alternatively a popup box that mentions all your hard efforts, and requests a voluntary donation via paypal. If you coded it so the box only appears a limited number of times, and only until a certain date, then you probably wouldn't alienate too many people with the popups, and hopefully many of us would donate towards the app's development costs.