<?php
class Kwc_Root_Category_Trl_Update_20151116UpdatePageNames extends Kwf_Update
{
    public function postUpdate()
    {
        $root = Kwf_Component_Data_Root::getInstance();
        $model = Kwf_Model_Abstract::getInstance('Kwc_Root_Category_Trl_GeneratorModel');
        $select = $model->select()->where(new Kwf_Model_Select_Expr_Like('filename', '%_%'));
        foreach ($model->getRows($select) as $row) {
            if ($root->getComponentById($row->component_id, array('ignoreVisible' => true))) {
                $row->save();
            }
        }
    }
}

<?php
class Kwc_Root_Category_Trl_Update_20151116UpdatePageNames extends Kwf_Update
{
    public function update()
    {
        $root = Kwf_Component_Data_Root::getInstance();
        $model = Kwf_Model_Abstract::getInstance('Kwc_Root_Category_Trl_GeneratorModel');
        $select = $model->select()->where(new Kwf_Model_Select_Expr_Like('filename', '%_%'));
        foreach ($model->getRows($select) as $row) {
            if ($root->getComponentById($row->component_id, array('ignoreVisible' => true))) {
                $row->save();
            }
        }
    }
}

--- 
+++ 
@@ -1,7 +1,7 @@
 <?php
 class Kwc_Root_Category_Trl_Update_20151116UpdatePageNames extends Kwf_Update
 {
-    public function update()
+    public function postUpdate()
     {
         $root = Kwf_Component_Data_Root::getInstance();
         $model = Kwf_Model_Abstract::getInstance('Kwc_Root_Category_Trl_GeneratorModel');
Move to postUpdate, like in non-trl
