No longer functional - Needs update for ios11 – Pro HDR Review

This was a pretty cool camera app, I have taken many great photos with it. But the developer has not updated it for ios11 - so the app is no longer functional, try to open it and you get an error message stating developer needs to update the app. NOT GOOD since I paid for this! Now why would I pay for any of their other apps they offer if this is what happens?
Review by Kmsweb on Pro HDR.