The easiest is that if it offers you with an installation file. You will figure out if that is the case if it ends in _theme.ocmod.zip. In that scenario, all you might want to do is visit Extensions > Installer Quite the opposite, with a developer’s eye with your OpenCart https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html