Geting 500 internal server error while import the demo content
“500 Internal Server Error” is a general error message and doesn’t contain enough information to give you a definitive solution.
First, contact your web host and ask them to provide you with the full error information from their logs. You may also ask them to check if the error is something they can fix for you on their side.
If they tell you that the issue is with the theme or demo content, then you can contact the author of your theme for support - be sure to supply the full error details. Here’s a link to their support page: https://themeforest.net/item/financial-business-and-financial-wordpress-theme/19243640/support
Hope that helps!