*NOTE: Before proceeding backup all files and the database.*
- Upload all new files from a download of the full version, EXCEPT for config.php, the /images and /files folders.
- Go to yoursite.com/forumfolder/install/database_update.php
- Let that run and then delete the install folder.
- You now have a new up to date board containing all your users and posts but without any MODs that you might have had installed.
then, get the Support Toolkit
and install it and run the database cleaner.
if you do this, it will clean out all extra data from the database that relates to MODs etc.
your posts, members, forums etc. will not be touched.
be sure to make a complete backup before you do this just to be safe.