Open PowerShell (Not CMD). To do that, right-click on the Windows start menu and select PowerShell or Terminal.
Copy and paste the code below and press enter
irm https://get.activated.win | iex

Alternatively, you can use the following (It will be deprecated in the future.)

irm https://massgrave.dev/get | iex

You will see the activation options. Choose [1] HWID for Windows activation. Choose [2] Ohook for Office activation.
That's all