There is no information about this inquiry. I have looked through the DesignStudio's website, but couldn't find anything regarding the compatibility of old application with the new one. However, the only thing that remains now is to install DesignStudio, then simply try loading the older files from the Cricut software.
If you need official support, then contact the developers of the application: http://us.cricut.com/home/support/contact-us
