Thank you @dkjb63411 ! This solution worked for me without changing the version manually on all .json files.
@HERO4K60 Check this article showing possible locations for the BuildConfiguration.xml Build Configuration | Unreal Engine Documentation
I put mine on in [USER_DIR]\Documents\Unreal Engine\UnrealBuildTool. I just had to fix the quotes and remove a trailing 21 in the xmlns declaration. After that I had to modify my VS install to include version 14.31 of the compiler and finally did a clean/rebuild.