Existing Installation

I already have Windows 11 installed but it's not activated and I have a product key.

1

Open Settings

Press Windows key + I, or right-click the Start button and select "Settings".

2

Navigate to Activation

Click on "System" in the left sidebar, then scroll down and click on "Activation".

3

Change Product Key

Click on "Change product key" next to the activation status.

4

Enter Your Key

Type your 25-character Windows 11 product key in the format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

5

Activate Windows

Click "Next" and then "Activate". Windows will verify your key and activate automatically if valid.

Alternative Command Line Method

slmgr /ipk YOUR-PRODUCT-KEY-HERE
slmgr /ato