It’s really easy and convenient to install Office Add-ins on App Source. Just clicking “GET IT NOW” button, the wizard will guide you to finish whole installation in one minute.
Further more, when you want to recommend this add-in to the whole organization, instead of installing it one by one, you can use “Centralized Deployment” to finish whole deployment in one minute too.
Here is the video to guide you how to achieve it step by step. Watch it and enjoy yourself.