I want to use phpGraphy for my web gallery but just can't seem to get a hang of it

. The instructions for setting it up goes thus:
"Get the latest phpgraphy tarball and upload it to your webserver. Once it's online,
simply open your webbrowser to the location where you've install phpGraphy.
It should detect the new installation by itself, in case it doesn't, specifically
request "install.php".
I tried uploading the latest phpgraphy with my Cpanel's file manager under the public.html but it's picking them a file at a time and there're so many files in the archive.
Has anyone used this photo gallery script? And how can I get around this?