[ovirt-users] Upgrade Host Compatibility Version

Hello everybody, for some days I upgrade our environment from ovirt 4.3 to 4.4.2 and now I stuck on upgrading the host compatibility version. It show there a compatibility until version 4.4. The VMs have a limit until version 4.5 and the cluster shows to that I can upgrade them until 4.5. On the cluster page is also a Upgrade guide, but this fails when I try that one. At the moment I have only one host to upgrade (no hosted engine)... Thanks for helping! Jonathan