You will want to check the Microsoft Support forums to make certain that you laptop meets the requirements for Windows 10 Pro.
Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.
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Yes you can. I did but had same issue as well. I had bought upgrade from Best Buy...had giftcard and it wouldn't work when applied new code either. Geeksquad joined and fixed, not sure what issue was.