How to get Windows 10 back?

[boomhower]

Let me preface this by saying I haven't used Windows outside of 7 at work for a long long time. My daughter has an older Lenovo AIO. It was acting up so used the software reset to put it back to factory. I had installed Windows 10 when they were doing the free upgrade. Now it is back to the Windows 8 that it came with. How do I get the Windows 10 back without buying it? Thanks guys.

 

[WilliamM2]

Since it was already on the machine once and activated, just re-install it without entering a key. You already have a valid digital license.

I've seen claims that the free update still works anyways with a valid Win 7/8 key when installing.

 

[bbhaag]

Try the second option on this page. The one labeled Create Windows 10 installation media. Go through the steps and when prompted choose either a usb ready file or the older and more common ISO file.
Use that image to install Windows10 on your daughters aio. When prompted for a key choose to skip that step and proceed with the install. Windows10 should automatically activate after the installation and updates are complete.

 

[Puffnstuff]

Another option is the assistive technologies route which offers an upgrade now button making it very easy to do.
https://www.microsoft.com/en-us/accessibility/windows10upgrade