4月9日的Volcanoes&Earthquakes UPGRADE应用程序分析

This legacy upgrade app is only for existing users who previously purchased it. New users should upgrade inside the main VolcanoDiscovery app, which is cheaper: https://play.google.com/store/apps/details?id=com.volcanodiscovery.volcanodiscovery This legacy upgrade costs more and is intended for special cases where the upgrade should work without being linked to a Google account or Google Play purchase verification (for example, offline or legacy use).