Unfortunately you cannot update from the 1.x platform to the 2.x platform at this time. See here : http://www.impresspages.org/cms/forum/viewtopic.php?f=7&t=828
However, you can port over your styles using the following information: http://www.impresspages.org/docs2/working-with-themes2/migration-guide-from-1-x/
I know the IP team is working hard at possibly having an import/export option for the future, but as far as I know there is no such work-around available yet.
Hope this helps~!