The developers have provided the following code: 

add_filter('wpforo_content_after', function ( $content ){
    if( WPF()->current_user_groupid === 4 && ! in_array( WPF()->current_object,  ) ){
       $content = preg_replace('#<a+href=+>+</a>#im', '<a href="#" rel="nofollow"></a>', $content);
    }
    return $content;
});

It should work fine. 

First thanks for such incredible script is very well done.

Trying to adapt this script that works very well to hide visitors links

add_filter('wpforo_content_after', 'wpforo_hide_links_for_guests', 10);
function wpforo_hide_links_for_guests( $content ){
    if( WPF()->current_user_groupid === 4 ){
        $content = preg_replace('|<a+href=+>+<\/a>|im', '<a href="#" rel="nofollow"></a>', $content);
    }
   return $content;
}

From this code need to exclude two different forums that have important links for guests.

like this

else {
  WPF()->current_forumid_key === 3,6 ){
        $content = disable;
}

Trying with

WPF()->current_object variable

But it doesn't work with the forum number:

 I am lost don't know how to add the exclusions so that the code does not apply in just two different forums.

Can help me?

Thanks in advance