Looks good, but once it’s installed, get the Write permissions OFF of the config.inc.php; we already have had one case where a Bad Guy added code to somebody’s config.inc.php to download spyware!
If the file on your remote site’s server could not be written to, then you would have to copy/paste the code into a config.inc.php file on your local machine, then using your FTP program upload the file to your /manager/includes folder.