Hi. I have a Windows 8.1 pro pack key, but it's impossible to use that key on Windows 10 home. At least the sales specialist told me so. So, I'll have to install Windows 8.1 home again, and after that activate the pro pack. And update to Windows 10 pro from there. My question is, the actual working key I have in my laptop with Windows 10 Home, is the same as before the update?