theme is missing the css stylesheet
just purchased the Presstige theme and attempted to upload but get a failed message and missing style.css stylesheet!
I replied to your other topic, so hopefully that will shed some light on the issue.
To answer this question specifically:
When you download your theme, the file will be named *ThemeName*_WP_Unzip.zip. Please unzip the file before installation (hence the file name). Your downloaded zip file contains graphic source files, documentation, and of course the theme installer.