sizzling :
You will need to buy a 8.1 licence and do HP supply drivers for your laptop and Windows 8.1? If no drivers are available Id advise against it as you can end up with issues you cannot resolve. It might work but the cost of a licence to then find it doesn't work properly is a concern.
Thank you @sizzling. Maybe I will try to download a non-license Windows 8 first to test if it will work or not.
Do you think the Windows 8 fits the hardware requirements of my laptop?