The easiest is if it offers you with an installation file. You are going to acknowledge if that's the circumstance if it ends in _theme.ocmod.zip. In that case, all you must do is check out Extensions > Installer OpenCart provides a trusted support team, comprehensive documentation, plus a community forum https://bookmarkpressure.com/story18555410/opencart-and-xero-things-to-know-before-you-buy