Search for "Windows 11 Enterprise Cloud Image" on the official Microsoft Evaluation Center. You will get a .vhd file, but you can convert it to Qcow2 using qemu-img :

The solution?

qemu-img convert -f vpc -O qcow2 Windows11.vhd Windows11.qcow2 Signed by Microsoft; includes optimized kernel for virtualization. Cons: Requires registration; 90-day trial (but you can re-arm). 3. Community Pre-Built (The "Easy" Button) – OSBoxes & CloudBase For home users who don't want to use the command line, community-driven projects like OSBoxes (osboxes.org) provide the most popular Windows 11 Qcow2 downloads.