Microsoft has long since ended the offer it had on Windows 10 and on old computers, an offer in which the user could update their Windows to Windows 10 for free at no cost.
And while it is true that many users have purchased the Windows 10 license for not taking advantage of the offer or did not update at the time, you can still upgrade to Windows 10 without having to pay anything.
Microsoft has not yet updated all its servers and that makes some update methods have not disappeared. The update through ISO is ruled out since then we will be asked for the new license, so you have to pay.
Free upgrade to Windows 10 is still legally possible
The ad in the notification bar has also disappeared, but the running installer is still on the Microsoft download page, as well as the one created through the ISO image, so through it we can do the free update.
In this case, we have to go to this website and download the ISO image, but we will not install through this image but rather create an installer that does the free update. We must remember that it is only the installer, although it seems very tempting, the ISO image is useless, unless we want to pay.
We do not know how long this installation method will last or how long this security hole will last within Microsoft, but it may last much longer than we expect. Microsoft cares that all users use Windows 10 and not old versions. So this could be intentional in the same way that Microsoft has also lowered the minimum hardware requirements that the operating system needs.
Personally, I would take advantage of this offer if I did not have Windows 10 yet, because nothing suggests that another Windows will appear again in a long time and it is also a much improved operating system compared to its younger brothers.