According to bug report I received today from Dear Tom, I have updated M3 installer on Google Code.
Please first uninstall the “old M3” and install this “new M3” instead.
Sorry for the inconvenience.
(Update: It seems Tom still cannot install M3 correctly. So I decide to clean up my notebook so as to set up a test environment later this week. Please turn back to M2 installation if you could and wait till I test M3 installer completely.
Because now I have less time than usual on coding and testing, forgive me if I made silly mistakes. My intentions were good.)