Unable to Install Error Style.css Missing

Dear Care,
I bought a word press theme yesterday. when I try to install the theme Its gives an Error msg"The package could not be installed. The theme is missing the style.css. Pls. get this rectified.
My registered Email id is [email protected] Invoice number: #COLORLIB7149
Payment date: September 5, 2021
Theme Name Oakberry

Hey there

Im sorry but its not a Wordpress theme, its a HTML template and you cant install it in Wordpress