Having issues loading a theme

I am trying to load a theme I just purchased, but when doing so, I keep getting this message"
Unpacking the package…

Installing the theme…

The package could not be installed. The theme is missing the style.css stylesheet.

Theme install failed.

Any ideas what I need to do?

Are you sure itd a WordPress theme?

If so go to your downloads page and hit “download” and choose “installable WordPress files only” and use that zip folder via WP admin.

Or unzip this and use FTP