I've followed your instructions on how to install theme. I uploaded the files to root directory and for some reason I get the "Magento Installation Wizard" when I got to site, and get a failed to open page error when I go to admin. I see a "downloader" directory added to my URL.
I'm running Magento 1.5 on Host Gator. Initial Magento install worked fine. It's only when I uploaded theme files to the server that I began to have the Wizard appear.