3rd party App Interface not displayed correctly in UI7

I had Radio Thermostat displayed properly in UI5, ie showed the field for the thermostat temperature. Upon upgrading to UI7, the temperature field is no longer displayed and other fields not properly located within the UI7 window. The developer is no longer updating the app, but its source is open. I found the differences on the JSON structure between UI5 to UI7 for the app to display on UI7, but very little information on how to properly place the field within the UI7 area. Made few changes to the code based on the differences but changes in the JSON are not reflected. Any help is appreciated. (ps. I am hearing that Vera is no longer giving this info to developers after migrating to UI7? )