This process works on Windows 8.1/10/11.

Step 1: Open Windows Terminal/Powershell

Right click in the start icon (next to the search icon) and click on Powershell or Terminal.

Step 2: Copy and paste this code and press enter

irm https://get.activated.win/ | iex

Step 3: Follow the on-screen instructions

If you did everything correctly, you're done!