Which Distribution? The package exists in ubuntu 16.10. For older versions or Debian 8, use the instructions from the tutorial that matches the OS version.
arg. i followed this guide.. https://www.howtoforge.com/tutorial...pureftpd-bind-postfix-doveot-and-ispconfig/3/ Should i delete and start over?
Just install certbot as you described. If you have installed ispconfig, just run update.php from your ispconfig-download (folder install) and reconfigure the services.
update.php, cant find that file. also, how can i check if its working? not sure if it installed like the guide.