A common issue that can arise when uploading your theme is the “Missing Style.css Stylesheet” error.
This error is typically due to the incorrect file being uploaded.
The overall theme file you received after purchase (i.e. Chanel-Wordpress-Theme.zip) contains numerous files inside, including Genesis, child theme (i.e. chanel_theme.zip), the installation guide, etc.
After downloading your theme, UNZIP the file. Follow along with the installation guide inside to install your theme — first upload the Genesis framework, followed by the child theme.