Legally Upgrading from Windows 8.1 to Windows 10 for Free: Current Possibilities

Hello.
Is it still possible to upgrade your computer from Windows 8.1 to Windows 10 legally and for free?

What is your problem, the key is already saved in the bios on the bank but to be sure read it with the winkeyproduct program, then download win10 version as you have now that is home, profesional or whatever you have but windos 10 must be AIO, you will find it already updated on the winclub website with the note aio, if you upload, he should automatically pick up the bios only during installation, do not enter the key, skip

I did it in January, ori was supposed to be win on this lap 8 I had 7 and I just downloaded the professional version from winclub because such a sticker was on the lap of course it must be aio, skip the key during installation, he will register himself if you have a legal

On this equipment has not yet been updated.

Added after 58 [seconds]:

OK, I'll try tomorrow.

Added after 4 [minutes]:

And what that means - must be AIO.

Added after 12 [hours] 20 [minutes]:

I don't have an AIO computer. I have a laptop.

Added after 23 [minutes]:

I was able to run the Windows 10 Upgrade Assistant.
But will it work for free, I still don't click. I'm afraid he will want a new key for which I will have to pay.
I await your opinions.

The free update was tangent to one, now it doesn't work anymore, I've tried it repeatedly, and if someone has a legal "myk" I would also like to know

And I think you can.
I decided to buy cheap Windows 10 from the Pcdirect store to have my wife install Windows 10 because she had Windows 8.1 before.
So I downloaded the Windows image and installed it.
I logged in and what was my surprise that I do not have to enter the Win10 key.
It turned out that Win10 is activated. And now I don't know what kaman is about.
Why did I get Win10 for free? I didn't even use the Pcdirect key.
Is Win10 still free?
But maybe it has something to do with the fact that I once created my wife a microsoft account for the Onedrive service. And now when I installed Win10 we assigned Win10 to the same address as Onedrive used to be and we now have the legal version of Win10 for free.
But it's such a fool, I'm not sure myself.

You set up a microsoft account and activated itself after logging in. I had the same.

Check if you have activated it, I recently did so (I have the key in the BIOS) and windows during the USB installation did not ask for the key, everything installed, however, Windows was not activated. After that, I tried to update the system from a link from the Internet that two years ago worked properly, after a few hours the update stopped. I called Microsoft and found out that you can't update Windows 8 out of 10 this way, these links from the internet don't work anymore. The lady gave me another e-mail link (probably individual), as if everything was the same as the links from the Internet, except that the link from the Internet after a few hours of installation - the installation stopped at (I think) 67%, link from a Microsoft lady after a few hours of installation correctly installed Windows 10 and the system is activated.

Well, I have activated, it is written in the settings.

Yes, Windows is actually activated.

So there is no other explanation why my Win10 has been activated.
The 99 percent is that I had a Microsoft account before.

I think so, because when I talked with a lady from Microsoft, she also instructed me to link my account (I had an account in Microsoft, but I have a few e-mails, this time (during these unsuccessful update attempts) I probably gave another e-mail and probably that's why I didn't have activation). The lady said that if I link this windows in this computer with my account, then every time windows will assign a key to myself, I will not have to enter anything. I learned one more important thing - namely, when I sell this computer, the buyer will have a license for Windows 8.1, but no problem, because the new owner will just call Microsoft and they will give him a link to upgrade to Windows 10.

It must be said - Microsoft cares for customers, I always had original Windows and something was wrong, I called them and almost always helped me, except for one time when the network scanner stopped working after automatic update, they wanted to help, but they recognized that it is too complicated (because it was so important - in this case it is difficult to help over the phone - I do not blame), and I managed with the scanner by turning off automatic updates (Windows 7), now it goes without a problem.