The most stable way to ensure all packages—including rvaddon.msi —are present is to download the full ISO for Visual Studio 2015 with Update 3.
The installation process for an MSI-based addon differs slightly from the standard VSIX (Visual Studio Extension) installation method used in modern versions of Visual Studio. rvaddonmsi+visual+studio+2015+download+upd
. However, you can still access the software through specific channels: Visual Studio Subscriptions: The most stable way to ensure all packages—including