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Hi,
If you want to upgrade from Home to Pro, and you don't have a license, go to Start > Settings > System > Activation > Upgrade to version.
A Microsoft Store window will open to purchase the Pro upgrade.
If you already have a digital or physical 25-digit license (if you wrote it down), go to Start > Settings > System > Activation > Change product key and enter your Windows 10 Pro key. It will ask if you want to upgrade to the Pro version.
If it's a digital license, you would have to do an offline update; please indicate this here.
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Thanks