If you purchased a download from Adobe within the last 30 days, you can request a return/refund. If not, as is your case, then you would be governed by the return/refund policy of the party that sold your the product. I would follow the message's directive to contact the retailer so that you do not lose any return/refund rights in this matter.
If you can do it as quickly as possible, trying to consult with Adobe on setting up from a redemption code is worthwhile. The link for that has already been given you. If Adobe points you to Ask the Community, that is us (user to user).