Y2021 license for download from Costco last year. I need to redownload it but the license number in my original purchase email does not work. How do I get it reactivated.

I purchased a Y2021 license from CC Costco last year. I need to redownload it but the license number in my original purchase email does not work. How do I get it reactivated. I have just been refused a refund to repurchase as an agent suggested.