Import Demo Problem

Dear Sirs,

We have repeatedly tried with my hosting provider to import the .xml file of the demo without success.
We increased the php parameters according (even higher) to http://blueowlcreative.com/support_wp/forums/topic/demo-data-not-imported/ and we tried again several times with no results..
Ultimately we tried to import the .xml file by splitting it into smaller parts with the WXR File Splitter (http://www.hongkiat.com/blog/split-large-xml-for-wordpress/) and we managed to import the demo but the hierarcy of the structure of the Fortuna main navigation menu was not imported (Appearance-Menus-Fortuna Main Navigation-Menu Structure).
Please let us receive your support to install the demo, otherwise the theme after all is of no use without the demo, since the demo acts as the template of the design.
Maybe to split correctly the xml file into smaller parts?

Best Ragards,
Angelo