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If you purchased the plugin from Envato market then to get auto-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.