No, you don't need a new Windows key when upgrading your motherboard.
No, you don't need a new Windows key when upgrading your motherboard.
Consider obtaining the key to avoid losing progress, since you could have safely reverted to version W8.1. You might also access a complimentary key via the insider program or attempt the upgrade using the provided link.
The link appears functional. Adding your new components and logging in should enable Windows 10 installation. Appreciate the assistance!
Also check the bottom of this page for guidance on hardware modifications.