I have created Excel Add-in in Javascript (Node.js), I used Yeoman generator. My add-in adds custom formulas to Excel. How can I create installer for this? I don't want to publish it in Office Store, I want to publish it on GitHub on or my website.
I thought about Office Product Addin wizard, but it's available only in Visual Studio, I'm using VS Code.
There is no way to make an installer for Office Add-ins because there's no way to get access to the internal Office code that hosts and reads the manifest. The supported ways of installing add-ins are described at Deploy and publish Office Add-ins. You should probably use Centralized Deployment.
Office web add-ins can't be distributed using installers. They must deployed or sideloaded somehow.
You can publish your manifest so users could sideload the add-in. Or administrators could deploy the add-in centralized, see Manage add-ins in the Microsoft 365 admin center.
The best what you could do is to publish your add-in to the AppSource (store), see Make your solutions available in Microsoft AppSource and within Office for more information. They are designed to be distributed that way.
The Deploy and publish Office Add-ins page describes all possible options.
I distribute my Add-in via installer, its just a bunch of regedits wrapped in an executable.
You'll be basically automating the sideloaing process.
There is no official method, but it surely can be done.
