У вашего броузера проблема в совместимости с HTML5
This should get you from Pepakura Designer to Silhouette Studio easy enough. That part is as easy as exporting your design from Pepakura as a DXF. It may need a little work if you're having problems, though, and that's most of what I'm covering here.
If you want to get the files I'm working with or any of Papermau's other free papercrafts, you should check out his blog. Here's a direct link to the church: http://papermau.blogspot.com/2011/06/igreja-com-cruzeiro.html
Stay tuned for more of this in the future.
There's a lot more to cover!