"Introduction to UE4 Programming" Tut Not Working Wit 4.6 ?

No, since the generated headers are regenerated on the fly and you are not meant to modify them, they are therefore treated as an intermediate file and kept separate.

If the header tool worked properly, it should say so in the build log. And you can reach the file (if it was created) by right clicking the include directive and choosing “Open Document”, I believe.