source: https://forum.proxmox.com/threads/how-to-install-win11-in-proxmox-quick-guide-and-fix-problems-of-network-search.136596/

link for virtio: https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/stable-virtio/virtio-win.iso

To get started, we need:

  virtio-win ISO
  win11 ISO

Next create VM, We need this:

  OS — use w11 image
  System — use SCSI controller — VirtIO SCSI | Bios OVMF (UEFI) and add TPM
  Disk — VirtIO Block and minimal disk size 64 Gb

Add CD/DVD Drive to Hardware, use IDE virtio-win Image. Now we can start VM and press Enter to Console VM. As usual, go through all the steps to the disk selection window. Next step: “Load Drive” We are looking for CD virtio-win. Open folder viostore > w11 > amd64. We continue with the usual installation.

But, I faced the following problem. In the network device selection window, but a network was detected and could not be skipped this step. My network device received IPv6 settings for DHCP. Open Shift+F10 console. Open taskmgr to stop network connection flow service. We can open Special features and change network setting on Windows. I set my current IPv4 parameter, and again stop network connection flow service.

Hooray, everything should go smoothly from here on out) But this is win11 :D