Class 4 Practice Results Restart New Quiz Restart New Quiz #1. How can you downgrade from a commercial licence to a non-commercial licence? Apply for the downgrade at a driver licensing office. Let your commercial licence lapse without renewing it. Requalify for the non-commercial licence. Don't submit your Driver’s Medical Examination Report when you're required to do so. To downgrade from a commercial licence to a non-commercial licence, visit a driver licensing office to apply for the non-commercial licence. Next