IMPORTANT:To upgrade an OES VM paravirtualized guest to OES 2018 or later, you must install using files on the network. Physical media upgrades and using ISO image files are not supported methods.
Performing a down-server upgrade on a Xen VM guest is very much like upgrading a physical machine
In Virtual Machine Manager, shut down the OES VM guest that you are upgrading.
Enter the command vm-install --upgrade at the terminal console.
On the Create a Virtual Machine page, click.
Selectif it is not selected, then click .
Select, then click .
In the Managed Virtual Machines list, select the VM guest you are upgrading.
In the Network URL field, type the URL to your network-based installation source, then click.
On the Welcome page, agree to the license and click.
For instructions on the rest of the upgrade process, go to Section 5.0, Upgrading to OES 2018 SP2 and continue from there.