[ovirt-users] Adding hypervisor fails, yum links deprecated (Centos 7.7/ oVirt 4.3)

Greetings. In a multi-hypervisor environment, we are running Centos 7.7.1908, with ovirt-4.3. There are problems adding a new hypervisor, because all the yum resources have switched in favor of newer versions. Is there a proceedure to add a hypervisor under the oVirt Virtualization manager while retaining an older, known working OS version like Centos 7.7.1908 ? Upgrading everything across the board isn't an immediate option. There are many VMs and hypervisors in production, and can't be disturbed. In sum: is it still possible to install known working 4.30.33-1.el7? All that is presented now is 4.30.46-1.el7 I ran: yum install vdsm-4.30.33-1.el7.x86_64. This completed. However, when I tried to add the resulting hypservisor using the oVirt web UI, that fails. Logs on that management server showed that the install process insists on using 4.30.46-1.el7. Any way to avoid this? 2020-07-22 20:30:58,621-04 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (VdsDeploy) [45782a5f] EVENT_ID: VDS_INSTALL_IN_PROGRESS_ERROR(511), An error has occurred during installation of Host hypervisor7: Failed to execute stage 'Package installation': [u'vdsm-4.30.46-1.el7.x86_64 requires lvm2 >= 7:2.02.186-7.el7_8.1'].