The latest version of the Dronelink app is no longer available on the Google Play Store.
Visit dronelink.com/download to download the latest version for your drone. For Android devices where users previously installed from the Google Play store.
The Google Play version must be uninstalled / deleted, before the APK version can be installed.
See this article to see the steps required for an APK install.
The issue is related to a update from the Google Play store that does not work with DJIs legacy MSDKv4.