Webhost: You should not have been running step 2 if you were upgrading.

That will uninstall my version of the hack, not Stasik's.
As for step 21 I believe there was an error in the SQL so I have changed that (and changed the step number to step==31).
I have fixed the misc.php issue you mentioned and added a step specifically for upgrading (step==41).
I also fixed a couple other minor issues.
I will add support for vB code if possible later today.