I got an email that my products is update, I can download, How do i update it on my website
If you purchased the theme from Envato market then to get one click update features you can use Envato Market WordPress Plugin. This plugin helps customers receive updates to their premium WordPress Themes & Plugins purchased through Envato Market (ThemeForest & CodeCanyon).
you can download the plugin from here:
otherwise you can download the update version from Envato Market Downloads page and update manually using ftp.
Note: Better to keep a full backup before doing the update.