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alanliew, Welcome to the XOOPS forum!
I think you have a problem to align the URL in your browser with the directory on your disk.
Check the location of mainfile.php. If it is c:\appserv\www\ mainfile.php, then the URL should be
http://localhost/, else add the subdirectories between in the URL.
Are you using the zip archives at a disc from the book? That may be an older version (which?). Download the current version here from the site.
Don't know the appserver, but else there is also a very easy and complete XAMPP server.