It is a terrible idea to require activating the root user to install software. Whatever the software requires for installation this should not be it. Broderbund's programmer doesn't quite know what he/she is doing.
If you are logged into a different user account, that is probably why you cannot see the installer. It must be in a folder of your other user account to which you do not have access. Just re-download it into your root user account.
Broderbund should provide a much cleaner method for installing their software. Not many users are safely able to activate and deactivate the root user account. Unless you cannot find other software that can do what this software does, I would look for a replacement. There is no limit of damage that an inexperienced user can unknowingly do with root privileges.