Thanks for the interest, glad you hear you are wanting to get Launch running on your AEM instance. AEM 6.3 had a native integration with DTM and 6.4 has one with Launch. If upgrading to v6.4 is not an option right now, you can contact your AEM account representative about requesting a new Feature Pack be back ported to a prior version.
If not, check the Network tab in your Dev Tools to make sure the Launch js file is loading. If there is a 404 error, it's usually because you haven't published anything to the Environment whose embed code URL you are using.