Thanks Claire. I truly appreciate the honesty.
I'll continue to use TR as long as I can. It's head and shoulders above other software in terms of GTD implementation, even without the fancy bells and whistles. I did hear that Apple is going to no longer support 32 bit apps starting later this year. I would, sadly, have to switch away from TR if the app doesn't work at all. So I wish you best of luck in finding a developer.
Also, I would pay at least double what I pay now to support development here. I'm sure others would as well. I realize a subscription model may not work since this is not cloud-based software, but have you considered a site such as Patreon as a way to get the community to support ongoing development? Just a thought.