Okay, here we go....
I'm using this hack also on my Forum and do some bugfixing in the german vBulletin Forum for this hack. I saw this thread here in at vBulletin.com yesterday night and found a lot of questions, problems and db errors, so I decided today to do a complete rework of this hack from my installed german version to a new english Version.
I worked now 8 hours on this hack and hope that most of the bugs are fixed
All changes from this forum and also from the german one are implemented in my new version.
So I also will give further support for this hack if using my new files for install.
Please read the installation instruction to see what is changed and work carefully through it to get this hack work.
have fun
@ oldfan
the name of the tableprefix is defined in the file config.php with $tableprefix, so the install script only reads the prefix name from there and installs your tables like that name.
After additional 6 hours with installing this hack in a new Testboard I found again several bad translations and also again some german words

Also 2 db queries has wrong syntax for prefixed tables again !
If you found misspelling or bugs please let me know that I can fix the download.
for a updated zip file please look some posts later