The ZIP has been updated today to address the issues with the install process deleting vBulletin's stylevars that occurs under vBulletin 4. It is not a new version, there are just some changes to the install code.
The issue with stylevars being deleted is actually a vBulletin bug, as documented
here, that VaultWiki and its users fell victim to. The changes posted today create a workaround to avoid the problematic vBulletin function.