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Please refer to this article which includes the requirements of the system to support Windows 10* Pro.
http://www.microsoftstore.com/store/msusa/en_US/pdp/Windows-10-Pro/productID.319935900 Windows 10 Pro: Upgrade or Purchase - Microsoft Store
Here you can find a how-to upgrade from Windows 10* home to Pro that can help you.
http://winsupersite.com/windows-10/how-easily-upgrade-windows-10-home-windows-10-pro How To: Easily Upgrade from Windows 10 Home to Windows 10 Pro | Windows 10 content from SuperSite for Windows
I would like to know what is the issue you are having with this, was the key rejected? Did you get any sort of error message?
You could provide me with a screenshot of the issue to better understand the situation. Just make sure you delete the key from the screenshot, this could be done with Paint.
I look forward to your reply.
the key isn't accepted to activate windows 10.
My key is now stuck after a Windows Update...so i can't show you a screen copy.
I don't remember the error code, but i was getting one for sure.
I'll contact the support to make a RMA on it.
Just found a solution !!!
I've found a post on Microsoft giving a Windows 10 Pro Generic Key :
I did enter it to change my version, it worked.
After a reboot, Windows asked me a working key for Win 10 Pro. I intered the one from my MS VLSC and it worked !!!