Product Key (Win 7) not accepted when upgrading to 10

Windows 10 Is Now Running!!

Summary:
When I originally clicked on the upgrade link from MS, it started the process but asked for the Win 7 product key. (But rejected it)
I then tried ISO files. This again asked for the Win 7 key & rejected it.
In post #34 by NavyLCDR, he provided a link. I had not seen this webpage in any previous attempts. From within Win 7, it downloaded and installed 10 without any reference to the 7 key! It was so easy, but why did the original upgrade link from MS ask for the key?

I am very grateful to all who responded, even though it seems to have caused some controversy! Thanks for your help and advice.

Peter

OldMike65 said:

This is GREAT NEWS Peter!!! Glad you got your Windows 7 upgraded successfully to Windows 10 Good Job Peter. :)

Thanks once again!

dusty100 said:

Thanks once again!

If I were you Peter, I would make a complete image backup and store this in a safe place. Just incase something goes wrong with your Windows 10 at a later date. This will give you insurance and the ability to restore your Windows 10. A good image backup program is Macrium Reflect, lots of us on here use this. Here is the link, and its a Free program also.
http://www.macrium.com/reflectfree.aspx

dusty100 said:

It was so easy, but why did the original upgrade link from MS ask for the key?

I am very grateful to all who responded, even though it seems to have caused some controversy! Thanks for your help and advice.

Peter

For some reason it was detecting the wrong version, edition or language of Windows 7 installed.