from here: https://rke.docs.rancher.com/config-options/system-images#air-gapped-setups > • For RKE v0.3.0 and above, the map of versions and the system image versions is located here: https://github.com/rancher/kontainer-driver-metadata/blob/release-v2.7/rke/k8s_rke_system_images.go > It's not easy to understand for RKE 1.4.6, why I need to download a v2.7 list?