I was trying to install a theme on WordPress 3.5.1. I tried uploading the zip file and I get the following message:
Unpacking the package…
Installing the theme…
The package could not be installed. The theme is missing the style.css stylesheet.
Theme install failed.
I tried unzipping it on my computer, and in the zip contents I find the style.css file. Installer doenst seem to find it though.