Hello,
today i tried downloading the latest version of nixos. to my surprise after installing nixos i saw an error message that the version was out of date
current version 23.11
however all download links download 23.05
https://channels.nixos.org/nixos-23.05/latest-nixos-gnome-x86_64-linux.iso
https://channels.nixos.org/nixos-23.05/latest-nixos-gnome-aarch64-linux.iso
https://channels.nixos.org/nixos-23.05/latest-nixos-plasma5-x86_64-linux.iso
https://channels.nixos.org/nixos-23.05/latest-nixos-plasma5-aarch64-linux.iso
All the best