Assistance Required for Downgrading ESXi Host from 7.0 to 6.7

[Jagan Mas]

I have a 4-node cluster running on ESXi 6.7. One host was upgraded to 7.0, but unfortunately, we don't have the 7.0 license, so we need to revert back. The upgraded host has now reached the end of its evaluation period. Since it's a downgrade from 7.0 to 6.7, we can't roll back directly. I will need to reinstall ESXi 6.7 while preserving the datastores, etc. There are no VMs running on this host, and it is currently in disconnected mode in vCenter due to the expired evaluation period.

Please advise on how to proceed.

[E_Espinel]

hello.
the quickest and easiest way is to reinstall from scratch, make sure the ESXi server is physically disconnected from any shared storage.
Check the contents of the ESXi server's internal datastore for VMs, ISO images or any other useful data.
Write and save the ESXi server data such as name, ip address, license and other data that will be useful when you reinstall the server.