If the MSI framework bugs out while evaluating setup project extensions, your local assembly system might need a quick reset: Visual Studio 2015 installation issue - Stack Overflow
When you install or upgrade Visual Studio 2015, the installer caches .msi files in C:\ProgramData\Package Cache\ . If these files are removed (e.g., via a system cleaner) or corrupted, the Windows Installer attempts a "self-repair" operation. rvaddonmsi+visual+studio+2015+download+upd
wmic product where "name like '%%RV Addon%%'" get version If the MSI framework bugs out while evaluating