It seams that you haven’t installed Visual Studio 2015 properly, the log informs you about it:
Packaging (Windows (32-bit)): UnrealBuildTool: Visual C++ 2015 toolchain does not appear to be correctly installed. Please verify that "Common Tools for Visual C++ 2015" was selected when installing Visual Studio 2015.
Also verify to not install SP1 of Visual Studio 2015.
ty to both of u this been long fixed ( forgot to leave a ty u )
