My laptop came originally with windows 8, then I upgraded the disk to a SSD drive where I translated my system from the original Hard Drive Disk. After a time I upgraded it to a Windows 10.
Now I have to return to the original disk with Windows 8, but Windows 10 is no longer available for free.
How may I upgrade to Windows 10 in my original disk with Windows 8?
If download a copy of Windows 10 to install, will it recognize my computer?
Provide the Windows 8 key: it should work.
See also https://www.howtogeek.com/272201/all-the-ways-you-can-still-get-windows-10-for-free/