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Upgrade license is digital only. It doesn't have the 5x5 key.
You can do this to upgrade and activate -
You can go to Settings > System > Activation > Change product key
Disconnect internet, and disable any third party antivirus, key in the generic key instead: VK7JG-NPHTM-C97JM-9MPGT-3V66T
That should get you to Pro. Once restarted, you can connect back to the internet, sign into your Microsoft account. See if it is activated.
Since it is digital license, and your upgrade portion is transferrable, meaning you can use it to upgrade another Home edition. If that happens in the future, very important, do NOT remove the old device from your Microsoft account.
You can repeat the steps above to install Pro on a new computer running Home already activated, then run this: go to Settings > System > Activation, run the troubleshooter, choose the hardware change option. When it asks you where it is installed on right now, you should choose the old device name. Then click on Activate button. And on the next screen when it asks you where to transfer it to, choose your new device name. This will transfer the license.