Endurance tamplate

I’m trying to install the template but get an error:

Installing Theme from uploaded file: endurance.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 tried to open the file by WINRAR and maybe found an installation file but got nothing.
please help!!

Hi there

Its not a WordPress theme, its an HTML template