WiX v3
The WiX v3 documentation is available here.
Releases
Recommended Build
WiX Toolset build tools include everything you need to create installations on your development and build machines.
WiX v3 Visual Studio Extension provides integration for WiX v3 into Visual Studio. You will still need to install the WiX Toolset v3.14 build tools.
Download the appropriate versions from the Visual Studio Marketplace: