Forum vBulletin 4.1.10 to 4.20 patch results in database error
 

I have a very large board. I recently patched the board to 4.2.0 Patch Level 3. Now, whenever anyone tries to make a post we receive the following error...
Database error in vBulletin 4.1.10:
Invalid SQL:
INSERT INTO thread
(prefixid, postusername, postuserid, title, iconid, visible, forumid, dateline, open, attach, lastpost, lastposter, lastposterid, replycount, postercount, hiddencount, deletedcount, keywords)
VALUES ...

After some research it appears that an upgrade script may need to be ran to upgrade the database from 4.1.10 to 4.2.0. However, I can't find this script and it doesn't exist in my install folder.

Does anyone know how to fix this problem?

Thanks in advance