@mikemunsonmusic: Hello Mike,
The Catch Import Export using the .dat file is for importing Customizer Settings file and not demo content .xml file.
You can use our Catch Themes Demo Import Plugin to import both the demo content file and then the customizer settings file that will make your site like the demo.
Install and Activate the plugin.
Go to => Dashboard => Appearance => Import Demo Data => Choose an XML file for content import: => Browse and Select the .xml file and Click on Import Demo Data.
Let me know if you want the demo customizer settings file as well and I have email it to you.
Kind Regards,
Skandha