Is t only 32 bit? Three years ago we’d already had 64 bit phones for a year.
Or is it some kind of API incompatibility?
I've bought the dictionary in 2013 and used on my previous model of iPhone too. My point is that the same phone which run the program for 3 years will stop running it as soon I allow the "upgrade" of the same phone to iOS 11. So I'm motivated to keep running iOS 10 and sacrifice security. Which is bad.
The developer however wasn't able to renew the license, so he can't make a new version even if he would like to do it.