This method guarantees a pristine, updatable Windows 10 installation.
Use virt-manager or the command line to boot the VM using the official ISO as the CD-ROM and your new .qcow2 file as the primary storage. windows 10 qcow2 file upd download
For optimal performance on KVM, download the VirtIO-Win ISO to ensure your virtual hardware (disk and network) is recognized during installation. 2. Pre-Built QCOW2 Cloud Images This method guarantees a pristine, updatable Windows 10