It looks like this is an issue where XenForo's ZIP add-on installer is not handling the popups (asking for user input) thrown by the VaultWiki installer in the same way as the standard or CLI installers. Hopefully there is a solution to this; otherwise we will just have to add instructions not to use the ZIP installer. You will need to manually create and set a user group for Wiki Moderators since the form did not open during installation. Hopefully nothing after it was skipped over.