Software won't let me upgrade

I tried to upgrade my software. When I clicked on “Upgrade from a previous version.” It apparently generated a discount code. However when I went to the store it just was a blank screen. Now when I try and upgrade again it says it already generated the discount code which I don’t have. I try to buy it from the store to see if it applied the discount to my account and it still wants to charge me. How do I claim my upgrade?

These are the instructions. At the bottom it says what to do when the store fails.

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