Hi @jonr,

I hope you are well today and thank you for your question.

Please make sure that you are using a new method of demo content install method as described below.

https://support.shufflehound.com/installing-demo/

It contains large amount of data which can be the issue of your web server therefore it generated 500 Internal server error.

You can fix this error as described on the below pages.

https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-internal-server-error-in-wordpress/

https://www.elegantthemes.com/blog/tips-tricks/how-to-fix-the-500-internal-server-error-on-your-wordpress-website

https://themeisle.com/blog/wordpress-internal-server-error-fix/

Best regards,
Shufflehound team