I recently upgraded a VM to version 13; then the Vmware Sphere Client said you can't edit the config of such VMs.
So, I tried the ESXi web client; but, lo and behold, it won't save changes.
Then I read this is done deliberately on ESXi free! Let me put this as friendly as I possibly can, have you ppl at vmware gone completely insane?! I've never seen such a grotesque act of sabotage. 'Here is a free ESXi, but hahahaha, we won't let you edit your VMs!'