pveversion

nano /etc/apt/sources.list.d/pve-enterprise.list

#deb https://enterprise.proxmox.com/debian/pve buster pve-enterprise
deb http://download.proxmox.com/debian/pve buster pve-no-subscription

apt-get update && apt-get dist-upgrade && apt-get upgrade -y && apt auto-remove

https://dannyda.com/2020/05/12/how-to-upgrade-from-proxmox-6-1-to-proxmox-6-2/

https://www.reddit.com/r/Proxmox/comments/k29tjt/upgrading_from_62_to_63_not_working/

https://www.reddit.com/r/homelab/comments/k4sy5n/proxmox_6215_631_updateupgrade/