Same for me. I get a different error now though. I’ve gotten past the initial UBT error and now get
ERROR: No 32-bit compiler toolchain found in G:\Program Files (x86)\Microsoft Visual Studio\VC\bin\cl.exe
I can’t find anywhere that has a resolution either. I’ve tried the repair tool for both 2017 enterprise as well as 2015 community. Tried uninstalling all three (both VS2015&17 as well as Unreal)and editing the registry entries, then re-installing just 2015 and unreal and get the same error as above. No idea why it won’t work! HELP