After you have made your purchase, you’ll receive a download link and license key alternatively you would be able to login to your dashboard from the website where you can find all the details about your product and download the plugin.
Upload via WordPress Dashboard
Login to your WordPress dashboard and navigate to Plugins > Add New > Upload Plugin, upload the ZIP file and activate the plugin
Manual Upload via SFTP/FTP
Manually extracting the plugin folder into /wp-content/plugins/. Which you can upload to your server using any FTP/SFTP or directly through your hosting Cpanel, check your hosting server guide for access to FTP/File Manager.
Always make a backup of your website and database before installing any new plugin or theme