Visual Composer – Live Drag & Drop Page Builder plug in won't install

Just as the title states, I am having trouble installing the Visual Composer – Live Drag & Drop Page Builder. When I try to install the plug in i get this message;

Downloading install package from http://hb-themes.com/repository/plugins/js_composer.zip…

Unpacking the package…

Installing the plugin…

Destination folder already exists. /hermes/bosweb26d/b2643/ipg.colton02071992/wp-content/plugins/js_composer/

Plugin install failed.

I’m new to word press and building sites so please go easy on me and make it easy for me to understand. Thank you very much!