[rootmt]

to show Turkish letters in URLs you should edit a funciton in
forum home -> includes -> functions_zseo.php

find: function zseo_cleaned_string($string) definition and change this function to this:

PHP Code:

function zseo_cleaned_string($string)
{
    global $vbulletin;
    
    $bit = iif($vbulletin->options['zointsseo_url_separator'], '_', '-');
    
    /*
    turker - fix start ----------------------------------------------------
    */
    $string=iconv('UTF-8','ISO-8859-9',$string);
    $find = array('?','?','Ş','İ','I','Ğ','?');
    $replace = array('?','?','ş','i','ı','ğ','?');
    $string = str_replace($find,$replace,$string);
    $string=iconv("ISO-8859-9", "UTF-8",$string);
    /*
    turker - fix end ------------------------------------------------------
    */
    
    $string = strtolower($string);
    $string = unhtmlspecialchars($string);
    
    $string = str_replace("'", '', $string);
    $words = preg_split("#[^a-z0-9]#", $string, -1, PREG_SPLIT_NO_EMPTY);
    
    $words = zseo_strip_stopwords($words, $bit);
    $words = zseo_limit_keywords($words, $bit);
    return implode($bit, $words);
} 


NOTE:
-Take a look at iconv usage.
-If your forum and local charset(which includes local characters, here is iso-8859-9) are same, delete the iconv lines.