https://www.windowscentral.com/how-transfer-windows-10-license-new-computer-or-hard-drive
How to tell if a Windows 10 product key is transferable
If you have purchased a retail copy of Windows 10, then you're entitled to transfer the license to another device multiple times. The same is true when upgrading a retail copy of Windows 8.x or Windows 7 to Windows 10, and you want to move the product key to another device.
Generally speaking, you can transfer a retail license as many times as you need, but depending on the scenario, and the number of times you transferred a product key, you may start getting an activation error. When this happens, you'll need to contact Microsoft to explain the situation and fully activate.
On the other hand, when purchasing a new computer with Windows 10 pre-installed, you're getting an Original Equipment Manufacturer (OEM) license. This means that you're not allowed to transfer the product key to another device (under the Microsoft rules). The same will be true when upgrading a device that came with Windows 8.x or Windows 7 pre-installed, because these are OEM licenses, after upgrading to Windows 10, the machine will inherit the OEM rights.
If you have an OEM license, you'll need to purchase a device that comes with Windows 10 pre-installed, or purchase a retail copy of Windows 10.
How to transfer a Windows 10 product key to a new PC
Uninstalling license using Command Prompt
slmgr /upk
Installing Windows 10 product key using Command Prompt
slmgr /ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
slmgr /dlv
Manual activation process
slui 4
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