Sideload Excel Add-In on MacOS Sierra

Introduction In a previous post we looked at the process of generating an Excel add-in and using mkcert to create private certification authority (CA) trusted by browsers. In this post, we continue the journey of developing office add-in by looking at the steps involved in side loading our add-in in an Excel host. Prerequisites The add-in how to guide for iPad and Mac sets out the following prerequisites: A Mac running OS X v10.