Plugin Install
There are few methods of deploying the plugin files to your server.
1) Download the plugin files to your local computer. Go to WordPress admin panel, click on Plugin » Add New. Then click on the Upload Tab, you will come to this interface:
Click Browse and locate the plugin archive you downloaded. Then click Install and activate
2) Another method would be to upload the plugin data through ftp. First. download the plugin files to your local computer and extract the files from archive. Then use a ftp client like WSFTP to connect to your server and copy the files to wp-content/plugins folder.
Go to WordPress admin panel, click on Plugin » Installed, locate the WordPress E-Commerce Software License Management plugin in the list and activate