If you are receiving this error “The package could not be installed. The theme is missing the style.css stylesheet.” while trying to install/update the theme, that means you are doing something not right.
Most probably you are trying to upload the full archive downloaded from Envato Market.
2. Or just download only the theme installer zip file and use this file instead. Please check the screenshot below for better understanding:
albums artemis background image built in slider changelog custom post types demo import discography display order events font page gallery jamsession latest tweets logo lucille maintenance template menu missing stylesheet options page builder page templates polylang product image recaptcha recipient email section settings share icons slide slider slider revolution stripe support theme customizer theme rating theme setup theme update translate translation transparent background transparent image user registration videos wpbakery page builder