Heh, I see that support deleted the files and directories for you. Congratulations!
For future reference, if you have trouble clearing out your web directory for a one-click install, you can rename the old directory to something else and create a new empty directory with the same name as the old one.
For example, say you have an annoying leftover file in your web directory yourdomain.tld. In the shell, you'd cd to your home directory and type "mv yourdomain.tld yourdomain.tld.tobedeleted" then "mkdir yourdomain.tld". The result is that your web directory would now be empty and ready for a one-click install. Later on, you can figure out how to delete the "tobedeleted" directory.
You can use this technique on any file or directory:
mv /home/yourusername/yourdomain.tld/main/wp-content/advanced-cache.php /home/yourusername/annoyingfiletobedeleted
or even the following if you want to delete a whole directory:
mv /home/yourusername/yourdomain.tld/main/wp-content /home/yourusername/annoyingdirectorytobedeleted
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