I would definitely recommend ~against~ using a torrent download. Usually not legal with a package like the v1.5 Uboats missions. I don't know if you can purchase on the US Amazon site from Italy, but it's only $10US (whatever the exchange would be to your currency), and is a download, and 100% legal...
Silent Hunter 4 Uboat Missions Download. I can no longer help you with this issue, unless you get legitimate software.