This VS2015 solution has two MSI projects, 32-bit and 64-bit. I have downloaded the Microsoft Visual Studio 2015 Installer Projects here: https://marketplace.visualstudio.com/items?itemName=VisualStudioProductTeam.MicrosoftVisualStudio2015InstallerProjects#qna
But still I get a message about unsupported projects when trying to reload the MSI-projects.
