same place as you grabbed inno.. go back & look for ispack5.5 ( exe or unicode.exe )
either one depending on where you are. The ispack installs a writing script tool, that you can visualy see how your installer image will look, use that to place your logo.
Code:
http://www.jrsoftware.org/isdl.php
Thats all I'll say on it, as the rest is up to you to READ & figure it out. I dont use it, because I dont like logo's in installers. Nice & simple will do.