Hello,
Have you followed the instructions carefully as described in our documentation https://www.8theme.com/demo/docs/legenda/index.html#!/installation ?
If you are still unable to install the theme, our specialists will help you. But this service isn’t for free. Please check this link: https://www.8theme.com/our-installation-service/
If you agree you can contact us at support.8theme.com.
Regards,
Eva Kemp.