Just wanted to mention that there were some applicants in this forum who gave the test that way without getting the email and IRCC later contacted them to retake the test because they had done it through the status link without getting the email. If this is a random thing or not no one knows.
To be on the safe side, it would be best for them to contact IRCC if they have not received the email invitation by dec 3rd which is their start date.