Short summary:
- Enter product key: Cscript.exe %systemroot%\system32\slmgr.vbs -ipk
- Get installation ID: Cscript.exe %systemroot%\system32\slmgr.vbs -dti
- Get phone number to receive the activation ID: notepad %systemroot%\system32\sppui.inf
- There' a bug in the original article - the filename to get the phone number is wrong
- Choose and call the phone number, follow instructions, receive activation ID
- Write down the activation ID received by phone (ideally write it directly to a notepad window to copy and paste then for product activation
- Activate product using: Cscript.exe %systemroot%\system32\slmgr.vbs –atp
- Verify product activation: Cscript.exe %systemroot%\system32\slmgr.vbs –dlv
- Enjoy!