Do I need the install_mod.php or can I just skip that stupid file and edit the index.php?

On another sub forum I tried installing, I went through 14 files, edited // and 1.5 hours and JACK came out of that. -- Then he left me with Shit. Lol.

#
#---------[ 1. UPLOAD ]-------------------------------------------------------
#

install_mod.php to /


#
#---------[ 2. RUN ]----------------------------------------------------------
#

install_mod.php

This is the first thing you see, when you open the ReadMe.txt in Dreamweaver. If you open it in NotePad, it's screwed -Royally.

I installed it under public_html/ as it said -- the / and went to Install.

I get this:

http://www.exodyus.net/install_mod.php

Warning: main(./include/common.php): failed to open stream: No such file or directory in /home/exodyus/public_html/install_mod.php on line 44

Warning: main(./include/common.php): failed to open stream: No such file or directory in /home/exodyus/public_html/install_mod.php on line 44

Fatal error: main(): Failed opening required './include/common.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/exodyus/public_html/install_mod.php on line 44

So I figured it might need to be put into .net/forum - and it gave me the same thing

Any Ideas?