I'm guessing v 4.0.4 made some changes to the Navbar template, the install instructions don't work anymore because the template has changed.
Step 2 of the navbar template change can't be found in the navbar template...not sure about any steps after that, stopped at 2 when it couldn't be found.
Code:
Find:
<vb:elseif condition="$vboptions['selectednavtab']=='usercp'" />
<li class="selected"><a class="navtab" href="{vb:raw vboptions.forumhome}.php{vb:raw session.sessionurl_q}">{vb:rawphrase forum}</a>
<ul class="floatcontainer">