I had something similar happen while upgrading. Didn’t find a way to fix the 
configs on the fly, but was able to un-pause the VMs using virsh, then proceed 
to handle the ovirt portions. Probably work for you as well.

> From: Marco Lorenzo Crociani <[email protected]>
> Subject: [ovirt-users] VM stuck in paused mode with Cluster Compatibility 
> Version 3.6 on 4.2 cluster
> Date: September 20, 2018 at 11:10:48 AM CDT
> To: users
> 
> Hi,
> we upgraded ovirt from version 4.1 to 4.2.6. Rebooted all vms.
> We missed two vms that were at Cluster Compatibility Version 3.6.
> There was a gluster/network IO problem and vms got paused. We were able to 
> recover all the other vms from the paused state but we have two vms that 
> won't run because:
> 
> "Cannot run VM. The Custom Compatibility Version of VM VM_NAME (3.6) is not 
> supported in Data Center compatibility version 4.1."
> 
> Can we force the CCV of the paused vm to 4.1?
> 
> Regards,
> 
> -- 
> Marco Crociani
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