the scenery going up and after 2,3, minutes it disappear and the default is before I installed your scenery.
First, it's 2-3 minutes, or it's 5-6 ?
Have you activated the scenery ? If you select Zurich from the Addon Manager menu, does it have a "Buy" option available, or there's a "Registered" menu item that is greyed out ?
If you have a "Buy" option available, it means you haven't registered the scenery yet, so it runs in Trial mode. In this case, select "Register Serial", insert your Serial Number and let it activate.