Hello, @jacqpot,
Thanks for your contact.
Could you please share the screenshot of the issue? You may use this site to upload and share the screenshot here: https://postimages.org/
Please make sure that your server requirements must meet the latest theme and plugins minimum requirements, this is my test site requirements: https://postimg.cc/wttf9r6N you may follow the same and then try to import the demo again.
And if still face the issue then please share the fresh new WP site Admin URL and Credentials with me here as listed below, in the private content area of this topic, so that I will further check it for you on your site and help you out.
WP Admin URL:
WP Admin Username:
WP Admin Password:
Regards 8Themes Team.