Windows 10 recovery - cannot be done with Win7 startup disk

There was a Windows 10 installation on a laptop which needed boot recovery after Linux had been installed on another partition and then removed or something like that. Tried with a Windows 7 DVD - the bootup disk complained that "this startup disk is not compatible with the Recovery version" etc - so I downloaded Win10 startup disk (install disk) from Microsoft, created a USB boot disk using Rufus, and used that to recover the Win10 installation.