Hello,
Actually, regarding the demo file of Graduate Pro Theme.
Download the ‘One Click Demo Import’ plugin for the demo setup. The plugin is recommended by the theme itself.
https://prnt.sc/qeodc4
The demo file is ready to download. It can be imported using the one-click demo import plugin.
Import demo data following the path Appearance > Import Demo Data. Here is the screenshot that can help you guide to one-click demo import.
https://prnt.sc/rp6blj
Hope this helps.
If you have further queries, let us know.
Regards.