Download plugin object code and put it at your /Plugins folder then follow nopCommerce standard plugin installation procedure to install plugin. Universal SMS Plugin is available under “SMS Providers” group on local plugins page. Once Plugin is installed go to your nopCommerce admin panel, and go to Configuration > Plugins > Local Plugins > Universal SMS Plugin. It will ask you to enter your license key, enter license key which you received on your registered email after purchasing this plugin from our website.
You may need to give read/write permission's to IIS user's on server where you deploy/host your website to install this plugin.