You're not doing anything wrong. Unfortunately the AutomaticUpdater control only supports working on Windows Forms applications. That is, the control has to be on the main form of your App (which in your case can never happen since you're hosted in the Excel process) and it has to be a Windows Forms app.
This initially seemed like a good design decision, but we're quickly realizing that this only works for about 80% of our customers. The other 20%, like you and quite a few other customers, can't use the AutomaticUpdater.
So, here's how we're addressing this:
- In wyBuild 2.6 we're adding support for WPF apps and apps written for .NET 4.0. (This doesn't affect you).
- In wyBuild 2.7/2.8 we're decoupling the AutomaticUpdater design to allow automatic updating for apps where you're not using a "main form" so to speak.
For now, however, you can use the silent update checking wyUpdate functionality. It isn't as nice as the AutomaticUpdater, but it's a good stopover until we release wyBuild 2.7 or 2.8.