Premium theme not installing

Hi everyone,

I need some help with the premium theme. I had no problems installing it with my first website but I am just starting my second website and after uploading I am getting the following error:

Installing theme from uploaded file: gp-premium-2.0.3.zip
Unpacking the package…

Installing the theme…

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

Theme installation failed.

I have the theme and premium theme. The right versions.
Is there something missing from the .zip file or am I missing something else?

Thanks.

Best,

Robin