Wow, what a shame. I installed it before that happened, and it works great. It's now past sundown and my phone is orange at long last.

I guess now I'm stuck on iOS 9 if I want to keep this?

For anyone who wants apple to reconsider, the feedback page is the best place, unless you know someone inside apple: http://www.apple.com/feedback/iphone.html

They actually pay more attention to feedback on that form than to other forms of complaint, rumour is.

edit: it seems that the app will expire in 90 days and need to be rebuilt. I'll hang onto their installer and hopefully that works.