Portable — Rvaddonmsi+visual+studio+2015+download+upd

Always verify add-ons through the Autodesk App Store or official developer websites.

You can find the 2015 release under the "Older Downloads" section on the official Visual Studio site Visual C++ Redistributables: rvaddonmsi+visual+studio+2015+download+upd

You should always download these directly from Microsoft to avoid malware. Always verify add-ons through the Autodesk App Store