private fun startInstalling(outputFile: String) {
        Log.d(TAG, "startInstalling")
        val path: Uri = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
            Uri.parse("file://$outputFile")
        } else {
            FileProvider.getUriForFile(
                this,
                applicationContext.packageName.toString() + ".provider",
                File(outputFile)
            )
        }

        val intent = Intent(Intent.ACTION_VIEW, path)
            .apply {
                putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true)
                setDataAndType(path, "application/vnd.android.package-archive")
                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
            }
        startActivity(intent)
    }