You can simply burn the Windows 10 ISO file to a CD and then boot from the CD to a Vista laptop. And then just upgrade?

Or is that not possible?

Upgrading is not possible, but reinstalling

You can find it here

https://docs.microsoft.com/...rade-paths

Vista? An update from Vista to Win7 and from there to Win10 may work. Of course, a valid license is required.

Nope on a CD it shouldn't be a DVD