protected function _unzip($file)
    {
        include_once Plugin::classPath('Installer') . 'Lib/pclzip.lib.php';
        $File = new File($file);
        $to = normalizePath($File->folder()->pwd() . '/' . $File->name() . '_unzip/');

        if (is_readable($to)) {
            $folder = new Folder($to);
            $folder->delete();
        } else {
            $folder = new Folder($to, true);
        }

        $PclZip = new \PclZip($file);
        $PclZip->delete(PCLZIP_OPT_BY_EREG, '/__MACOSX/');
        $PclZip->delete(PCLZIP_OPT_BY_EREG, '/\.DS_Store$/');

        if ($PclZip->extract(PCLZIP_OPT_PATH, $to)) {
            list($directories, $files) = $folder->read(false, false, true);
            if (count($directories) === 1 && empty($files)) {
                $container = new Folder($directories[0]);
                $container->move(['to' => $to]);
            }

            $this->_workingDir = $to;

            return true;
        }

        $this->err(__d('installer', 'Unzip error: {0}', [$PclZip->errorInfo(true)]));

        return false;
    }