There are two ways to install your plugin. The first and easiest method is to upload a WordPress plugin from wp-admin area. The second is manually installing a WordPress plugin using FTP.
For that first, you need to manually download the new plugin package from your Codecanyon account. Once you have the new plugin package, you can choose to upload the plugin via WordPress or via FTP. Please see the information below for how to download new files, and install it via WP or via FTP.