Wincc flexible 2008 sp4 Asia migration

Hi
I have project of a multi panel created with wincc flexible 2008 sp4 Asia and I need to migrate it to tia portal V14 or V15 to put it in a comfort panel
The problem is that Tia portal doesn't support migration from sp4 so I need to migrate the project to Wincc flexible 2008 sp5 Asiatic and then to tia portal which is another problem because I didn't find the sp5 version of Wincc 
So can I get some suggestion !!!!