When you edit the bm, show advanced options, then under system and advanced options. See the attached screenshot. Eric Evans Digital Data Services LLC. 304.660.9080 *From:* Bill James <bill.james(a)j2.com&gt; *Sent:* Tuesday, April 14, 2020 6:52 PM *To:* users <Users(a)ovirt.org&gt; *Subject:* [ovirt-users] upgrade VM cluster compatibility version I'm trying to upgrade my cluster to 4.3. Currently its running 4.2.8.2-1.el7. But the cluster compatibility version is 3.6. I try to change that and it says I need to edit the VM. https://www.ovirt.org/documentation/upgrade-guide/chap-Post-Upgrade_Tasks... says: *Important:* An error message may warn that some virtual machines and templates are incorrectly configured. To fix this error, edit each virtual machine manually. The *Edit Virtual Machine* window provides additional validations and warnings that show what to correct. Sometimes the issue is automatically corrected and the virtual machine’s configuration just needs to be saved again. After editing each virtual machine, you will be able to change the cluster compatibility version. I edit the VM and there are no errors or warnings. I see no way to change the cluster compatibility level on a VM. How do I change the Custom Compatibility Version?? ------------------------------ This email, its contents and attachments contain information from J2 Global, Inc. and/or its affiliates which may be privileged, confidential or otherwise protected from disclosure. The information is intended to be for the addressee(s) only. If you are not an addressee, any disclosure, copy, distribution or use of the contents of this message is prohibited. If you have received this email in error, please notify the sender by reply email and delete the original message and any copies.