When does the "One Month of Free CMC" coupon expire? Brenda May 06, 2020 16:18 Updated Follow It expired on May 1, 2020. You have to use this coupon by 4/30/2020. After that, it will no longer be redeemable. Related articles Can I use the CMC coupon code on multiple cameras? Webcam Firmware Instructions What happens after the "One Month of Free CMC" coupon ends? My CMC trial has expired. How do I use the coupon code? Why is the coupon only good for 14 days? It says one month.