Use the Windows Media Creation Tool
https://go.microsoft.com/fwlink/?LinkId=691209 to download a Windows 10 ISO (approx 3.8GB which will fit on the smallest blank DVD which has a capacity of 4.7GB).
Burn to DVD disc.
Use new Windows 10 DVD to partition/format/install Windows 10.
When Windows
10 asks for a key - use your Windows
7 key and after it starts, it will activate (no payment required).
I created a bootable USB and got it to work, installed W10 Pro, but his original key which I had copied back in 2017 failed to activate.
His PC ran Windows 7 Ultimate 64bit fully activated and geniune up until I decided to do the advertised W10 update back then, I am guessing that was why I copied the Key. Though for some reason I remember something being said on the forums about a new key getting generated when anyone updated. Back then the Window Validation tool and compatibility tools stated no problems and the update should have had no issues, but I am guessing that the near full 120gb SSD left no room for some sort of update protocol regarding something or other with old files.
No idea, the old key does not work, it was two years ago I think I tried and it failed, should have done something then but left it and my lad never complained. Bigger issues currently as his W10 install did not solve the issues we were having with blue screens and looped something or other that the latest AMD driver stated it would rectify.
Looks like I have two failing MSI HD7950 Twin Frozr GPU's now, as putting in an Nvidia 1050ti solved the issue.
Now need a new GPU and new W10 licence.
I remember I decided not to use W10 as I did the W10 beta with the Insider program, but never was given a clear answer as to wether or not I would Get W10 Pro or Home, nor did I frind it intuitive. It seems slightly better than I remember but loathe to try upgrading the other three PC's after this failing. Retail instead I guess.