With that open in the browser, go back to the marketplace within the backend and click the icon in higher correct corner to open this menu: During the screenshot over we see a warning to delete the install folder, so we delete it ; all this is for safety: Nowadays https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html