Wavesynth Tutorial help

Hi I am looking at this tutorial and wanted to compile the 4th header file (04.h). However, it does not show up in my projucer, only 01.h. I included the header file in the main.cpp file as #include “WavetablesSynthTutorial_04.h”.

My question is why only this header file shows up?

And now I get a new error "the build tools for Visual Studio 2017 cannot be found even though I was able to hear a dissonant sine wave previously