Hi everyone!, I've been running into this error every time I try to upgrade to version 4.0 ([ ERROR ] Failed to execute stage 'Setup validation': Trying to upgrade from unsupported versions: 3.5). There's an excerpt below of the engine- setup output: INFO ] Stage: Setup validation [ ERROR ] Failed to execute stage 'Setup validation': Trying to upgrade from unsupported versions: 3.5 [ INFO ] Stage: Clean up Log file is located at /var/log/ovirt-engine/setup/ovirt-engine-setup-20160630150931-ahkjnm.log [ INFO ] Generating answer file '/var/lib/ovirt-engine/setup/answers/20160630151045-setup.conf' [ INFO ] Stage: Pre-termination [ INFO ] Stage: Termination [ ERROR ] Execution of setup failed I've been googling about this issue but this is one vague reference only. Then if I tried to downgrade to my current version ovirt-engine-setup-3.6.7.5-1.el7.centos.noarch" doesn't allow me: Resolving Dependencies --> Running transaction check ---> Package ovirt-engine-setup.noarch 0:3.6.7.5-1.el7.centos will be a downgrade --> Processing Dependency: ovirt-engine-setup-plugin-ovirt-engine = 3.6.7.5-1.el7.centos for package: ovirt-engine-setup-3.6.7.5-1.el7.centos.noarch ---> Package ovirt-engine-setup.noarch 0:4.0.0.6-1.el7.centos will be erased --> Finished Dependency Resolution Error: Package: ovirt-engine-setup-3.6.7.5-1.el7.centos.noarch (ovirt-3.6) Requires: ovirt-engine-setup-plugin-ovirt-engine = 3.6.7.5-1.el7.centos Installed: ovirt-engine-setup-plugin-ovirt-engine-4.0.0.6-1.el7.centos.noarch Currently I'm not able to start the ovirt-engine service nor go back to version 3.6. Any helps are more than welcome, Ariel