Thank you very much.Hi Jorge,
don't know if this helps but on Page 6 (Post: #58) I describe roughly the process I went through to "upgrade from windows 10 to windows 10 again". I described in #58 how at a certain point I got to a (I think) purplish screen (or some such colour) where you get asked to put in your Windows key - at this point I got unsure because I was worried that if I entered the key I would get a new (clean) install (did not know for sure if this was the case, but didn't want to take the chance)... I think you will find the rest in my #58 Post. (you do first need to download a W10 System copy onto a Flash - I think mine was 4GB which was large enough - but NOTE: it will delete anything else on the drive - best use a clean Flash) AND NO, doing it my way I did not enter my Key anywhere (just kind of repaired the old W10 - and kept all my stuff). Check out the whole 7 Pages for other details that might help. Good Luck!