Hi DarrenC1,
We are going to make these steps more visible and easier to find for folks. Sorry that has not been the case. The process is not really straight forward; I guess we were hoping folks would upgrade their 8 PCs to Pro and then upgrade to 10. Well we have lots of people and lots of scenarios and lots of folks want to start fresh.
From your Windows 10 Home running Version 1511, enter the Windows 10 Pro Default key under change product key.
VK7JG-NPHTM-C97JM-9MPGT-3V66T This default key will not activate the system, just take you to Pro so you can activate using a valid Pro key that you will provide.
Once you have done this, the system will go through an upgrade process from Home to Pro, but will not be activated on Pro. You can now enter your Windows 8 Pro key into your Windows 10 Pro system and it will activate.
I hope this helps
Charles
sir, originally this laptop was purchased from USA through my brother and window 8 was installed originally and I have not product key of window 8 hence in the circumstances how I can get the product key