Super Navi app, but where is the update?

After searching and testing long I finally found a Naviapp which offers all the features I need (OSM maps, import GPS routes, aufzeichen tours, offline navigation and offline address search, etc.) The app is really great and at a bargain price. Meanwhile, I am angry but to have bought in the Amazon Appstore for everywhere there is an update to version 1.4 not only here. For this, the app can not: hence 5 stars for the app and 1 star for the store of also still runs very slowly.