Can’t find ‘apksigner’ executable to manually sign APK
apksigner shipped with Android SDK Build Tools 24.0.3 (see https://developer.android.com/studio/releases/build-tools.html). The tool can be found in the Android SDK’s build-tools/<tools version> directory. For example, build-tools/24.0.3/apksigner on Linux/OSX and build-tools/24.0.3/apksigner.bat on Windows.