We do not want to use ClickOnce to deploy the AddIn because we really have a bunch of AddIns to deploy along with .NET Framework 3.5, VSTO 3, several other prereqs, various system components, GAC assemblies and other managed applications such as tray apps and system services.So currently I am writing an MSI to lay everything down on the machine and then call out to %CommonProgramFiles%\Microsoft Sha