What I did was installed a fresh copy of joomla 1.5 on my site, so I was then left with a default theme template, I then extracted the "rocketlauncher" on my pc and copied over all the files from that to my server via ftp.
Thanks Ace, ps sorry for posting in wrong section.
Ok I got this installation going now I,m trying to work out where I find these details "Insert your Database information: host name, mysql username and mysql password then click next"
Don't do it that way...since you already have a Joomla site set up, you want to use the Quantive Bundle package.
Of course, it will be without all the demo content and pre-installed modules.
In order to have it just like the demo site, you'll need to start from scratch in a subdomain or something if you want to keep what you have on there now. Have a read about the differences between the packages.