question: private static String computeSdkRegistrantsKeyV3 ( ) { return SDK_REGISTRANTS_KEY_PREFIX + "_" + getInstallationId ( ) ; }
target:  Version 1 key was just "SdkRegistrants". Version 2 key was "SdkRegistrants_installationpath" (see computeSdkRegistrantsKeyV2 above). Version 3 key is "SdkRegistrants_installationID".