Beginning with VS 2015, there is no longer a merge module to install the VC++ redist. This means that we need to use vcredist_x64.exe to install the VS 2015 CRT and Universal CRT on any machine as part of the installation process. The only way to do this is to use Wix Burn.

As a result of this, the default download links for the MSIs for the Enterprise Build, and SSL builds will need to point to an EXE. This EXE will first install the redist if needed before running the MSI installer. We should still offer the MSI though for customers who want to manage the redist installation themselves, and want the flexibility of the MSI installation procedure.

See for more details:
https://blogs.msdn.microsoft.com/vcblog/2015/03/03/introducing-the-universal-crt/