[php] php-update: how to?

I am trying to use the php update “software” (if that’s what it is called), but I am completely lost. I am NOT a php programmer at all. I know next to nothing.
Those who are not familiar with this, here is a site: http://www.php-update.co.uk/

I’m basically just looking for a basic run-down on either how it works, or how to implement it within my own layout. I am getting many clients who are music artists, and it would be nice if they could update the websites on their own.

Could someone recommend an easier way to do this with the same features, or explain how to use this? I would greatly appreciate it. BTW, I downloaded the files needed for the flat-file version of the “software.”

Cheers.