[kh99]

Seems like you could make your own index.php using this article as the base: https://vborg.vbsupport.ru/showthread.php?t=62164 or else modify your existing index.php with something like:

if ($vbulletin->userinfo['userid'])
{
    // show 'logged in' page
}
else
{
   // show register page
}

Or you could just redirect to another page, for example if your current index.php shows the member page, you could do this:

if (!$vbulletin->userinfo['userid'])
{
   $vbulletin->url = 'registerpage.php?' . $vbulletin->session->vars['sessionurl'] ;
    print_standard_redirect("Some message", false);
}

where "registerpage.php" is whatever page you want to send non-members to. (of course the register page would also have to allow login).