I had found answer reading their documentation:
1. TIMING
a. Campaign Period: Campaign Period begins July 11, 2023, at 9:00:00 AM Eastern Time (“ET”) and
ends on September 30, 2023, at 11:59:59 PM ET, or when supply of Coupon Codes is exhausted,
whichever occurs first. Please consult the world clock for time zone conversion information.
b. Purchase Period: To receive a Coupon Code, Participant must purchase an Eligible AMD Product
during Campaign Period from a Participating Retailer.
c. Redemption Period: The Coupon Code must be redeemed no later than October 28, 2023, to
obtain Application downloads after which the Coupon Code is void.
In short: only time of purchase matters and you will have next month to go through all the other steps.