SOLVED What product key do I use after Upgrade to Win 10

[nownthen]

I upgraded from Win 7 to Win 10 and I don't know what Product key to use if I have to ever do a reinstall of Windows 10. I went to: Settings - Update & Securities - Activation; and it stated -- this device is Activated with a digital entitlement.
What does this mean and what would I use as a Product key if I ever have to reinstall from my iso disk.
PS I do have a Product ID# but not a Product Key#.

 

[joetech1]

THE SAME KEY YOU USED TO UPGRADE and you you want to be safe here is a key finder on your pc

here is the link
https://sourceforge.net/projects/ekeyfinder/

and you can download the windows 10 here be sure you know if you 32 bit or 64 bit
you can make a dvd or usb

https://www.microsoft.com/en-us/software-download/windows10

 

[Saltgrass]

Windows 10 keeps its key online. Once activated, that machine will always activate a Windows 10 install without you needing to enter a key.

You cannot take that activation to another machine.