2)This theme is build from the default prestashop theme, and only has little modification to the CSS.
3)No modules only theme, very simple.
1)Upload the ZIP file from Prestashop Admin Panel. (Themes ->Add theme ->Upload the ZIP File.)
1)Colors Change:In order to change the primary "green" color. Please to this:
2)On the global.css search for "#99CA3A" and change for your color.
3)Also you must to that on the css/modules/ folder too. (blockcart, etc)