Do I have to update EVUS after November if I receive my visa in October 2016?

Yes. Starting on November 29, 2016, U.S. immigration regulations will require that all People’s Republic of China passport holders carrying 10-year B1/B2, B1, or B2 visas must have a valid EVUS enrollment before traveling to the United States. It does not matter when your visa was issued. Once the system is able to accept enrollments, you will be able to enroll at any time prior to your departure.