Simply upload the new zip file under plugins -> Add new -> upload (for plugins) or Appearance -> Themes -> add new for themes.

If prompted to replace the current one, confirm.

Remember that sometimes themes and some plugins (Elementor, Yoast) may require unzipping first, and uploading of both versions (free & pro) to your site for an update to be complete.

Please turn off auto-updates for any plugins purchased from WorldPressIT and download the new versions only from our site.

No, the plugins have an API connection between them and the author's website. When you attempt an update through your admin panel, the plugin attempts to verify your license through the author's website. Since you did not purchase from the authors (for a significantly higher price), that check fails, and therefore functions fail. It's imperative to install all plugins of all versions from our zip files only.

Please turn off auto-updates for any plugins purchased from WorldPressIT and download the new versions only from our site.

You may use the plugin forever, but you will not receive any further updates when your 6 months of free updates expire, if you did not get lifetime updates when purchasing. Also if you are a premium member of Gold, Elite or Lifetime plans, you have lifetime updates for all the items you've downloaded.