
Use the following chart to determine which activation method you'll use: From here, you can also see how much this upgrade will cost.

#Windows 10 pro serial key 10.0.10240 update#
Select the Start button, select Settings > Update & Security > Activation, and then select Go to Microsoft Store. Note: If you don't have a product key or a digital license, you can buy Windows 10 Pro from Microsoft Store.
