I am trying to make the navigation arrows larger.  Checking out the 'Theming' area it says that I need to change the icon.  To do that I downloaded the http://www.juicebox.net/release/juicebox.dev.svg.zip file.  When I attempted to extract it both Windows Explorer and WinZip said it was invalid or corrupt.  Where can I get a working version of these icons?

Thanks.