When you buy any theme, Theme Provider, provide one demo link of Theme where you can check styles & features as well as widgets which you want. Just browse demo link and copy paste widget in your site.
Hope this will help you...
I have nulled one, cant access StudeoPress
Shoutmeloud is a custom built page.
However, you can use a paid plugin to design a landing page. https://vc.wpbakery.com/
He might of even used that plugin to do this because I've used this plugin and know it. It's worth the price tag.