Are you trying to install the theme as plugin? You can install the theme archive only via Appearance > Themes you can’t install it like a plugin because theme and plugin are different things.
Read documentation https://xstore.helpscoutdocs.com/article/12-theme-installation
You can find the WooZone plugin code in the Private content area.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.