“Pro” version not available – Vidometer Review

I downloaded this app to be able to use the map function in the Pro upgrade. However, I keep getting the msg “Unable to connect to the iTunes Store” to buy the upgrade. So it’s pretty much useless to me. Could be a problem with iOS 12, since the app hasn’t been modified in a long time. Wrote to developer but got no response.
Review by Mistergizmo on Vidometer.