i don t have 8.1, I tried it with 7. started a new thread
Unable to generate c++ projects file 4.9 - Pipeline & Plugins - Unreal Engine Forums , im currently working on 4.9.2 i thought i almost had it but threw a similar error about building it then it sent me to visual studio to build it, Visual studio said I needed .net 4.5.1 to build it so I got that and it reverted back to the original failed to harvest error.