I have just purchased the MiEvent theme and when I try and install it I get the following error:
The package could not be installed. The theme is missing the style.css stylesheet.
Theme install failed.
Thank you for using our theme..!!!
You have to download again from theme forest, then you have to try installation of theme.
For more convenient way to install please follow our documentation.
Link : http://multia.in/theme/wordpress/mievent/documentation/#!/documenter_cover
Multia Support Team