The best is that if it provides you with an installation file. You may identify if that's the situation if it finishes in _theme.ocmod.zip. In that scenario, all you might want to do is check out Extensions > Installer All over this tutorial we noticed how you can install OpenCart https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html