The easiest is if it offers you with an installation file. You can understand if that's the scenario if it ends in _theme.ocmod.zip. In that circumstance, all you might want to do is visit Extensions > Installer During this tutorial we noticed ways to install OpenCart inside a Windows environment, https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html