Some premium, large or custom WordPress plugins may require you to install them through FTP.
1. Connect to your hosting with FTP.
2. Navigate to the directory containing your WordPress site.
3. Upload your plugin to the /wp-content/plugins directory.
4. If your plugin is zipped, you will need to unzip it (This can be done via the cPanel File Manager, using 'Extract' to decompress the files)
5. Your plugin should now display on the Plugins page within your WordPress Dashboard.