Style.css stylesheet Missing

I just bought a single license template but the theme fail to install. Below is the error message. The solution in the support forum doesn’t tell me how to fix the problem. I need to install this template asap. So, please help with a real solution.
Bellow is the ERROR MESSAGE:

Installing theme from uploaded file: azenta (1).zip
Unpacking the package…

Installing the theme…

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

Theme installation failed.

Hey there

Its not a WordPress theme, its HTML website template and its impossible to install as a wordpress theme