Hi Ron,
You'll have to combine the steps for 2.3 -> 2.4 and 2.4 -> 2.5. I've done this for you below:
1. Put the script in maintenance mode (Settings -> Maintenance).
2. Back up your database (Tools -> Database Backup) and your files.
3. In the v2.5 download, do the following:
- delete all the text files in /upload/includes/words/
- rename the admin folder /upload/admin/ to match your admin folder.
- rename the /upload/ folder to match your /comments/ folder.
4. Upload the /upload/ folder onto your existing comments folder to overwrite everything.
5. In the pages where Commentics is integrated, do the following:
- remove the line: ob_start();
- remove the line: <link rel="stylesheet" type="text/css" href="comments/css/stylesheet.css"/>
- remove the line: define('IN_COMMENTICS', 'true'); //no need to edit this line
6. Delete the file
http://www.domain.com/upload/includes/db/details.php
7. Run the upgrade
http://www.domain.com/upload/installer/
8. Log in to your admin panel and make sure everything is working.
9. Take the script out of maintenance mode (Settings -> Maintenance).