I have wasted three days and hours on hold with host (GoDaddy) technical support on your Starter theme. I don't know what else to do. I've uninstalled and reinstalled Wordpress, upgraded the PHP and Max Upload settings and continually get the same error and the same stall when I write anything to the file. The error I get about 3/4 through Design Importer says.
Server returned "Internal Server Error" while importing. It usually means misconfiguration in server/Wordpress.