Best method for updates?

FTP doesn’t want to work with ftp client. I see their is an upgrade package sources but I see no reference to how to use that or set it up in the actual manual. So what is the best method for upgrading?

http://www.mikrotik.com/docs/ros/2.8/system/upgrade

Ok thanks for the manual reference. For some reason when I did a search for package in the pdf manual in acrobat it found no references.