Downloads are available for those with a free Dev Essentials or a paid subscription at My.VisualStudio.com Older Downloads Page:
If present, the RVAddonMSI is correctly installed. rvaddonmsi+visual+studio+2015+download+upd
Searching for the specific file rvaddon.msi usually relates to troubleshooting installations or addressing "setup package missing or damaged" errors during an update. Because web installers for Visual Studio 2015 were retired in 2021, the most reliable way to obtain these components is through an ISO image from the Visual Studio Older Downloads portal. Troubleshooting rvaddon.msi and Setup Errors Downloads are available for those with a free