Grav\Plugin\Admin\Gpm::download PHP Method

    private static function download(Package $package, $license = null)
    {
        $query = '';
        if ($package->premium) {
            $query = \json_encode(array_merge($package->premium, ['slug' => $package->slug, 'filename' => $package->premium['filename'], 'license_key' => $license]));
            $query = '?d=' . base64_encode($query);
        }
        try {
            $contents = Response::get($package->zipball_url . $query, []);
        } catch (\Exception $e) {
            throw new \RuntimeException($e->getMessage());
        }
        $tmp_dir = Admin::getTempDir() . '/Grav-' . uniqid();
        Folder::mkdir($tmp_dir);
        $filename = $package->slug . basename($package->zipball_url);
        file_put_contents($tmp_dir . DS . $filename . '.zip', $contents);
        return $tmp_dir . DS . $filename . '.zip';
    }