I tried to import a theme and I’m getting this message.
“The package could not be installed. The theme is missing the style.css stylesheet.”
Google is your best friend here. Try the link below:
I know, no need to mention it. I am a genius! 
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You should contact the author of that item to get your solution. Only they can help you to get the best answer. Cheers. 
Check the theme you downloaded from account has folder and files