[2017.07.18-06.42.23:414][ 93]UATHelper: Packaging (Windows (32-bit)): WindowsPlatform.GetDefaultCompiler: WARNING: Visual Studio 2017 is installed, but is missing the C++ toolchain. Please verify that “Common Tools for Visual C++ 2015” are selected from the Visual Studio 2015 installation options.
Go to control panel and choose change for visual studios
Find toolchain and install it, maybe under individuall components!