[ovirt-users] Failed to execute stage 'Setup validation': Trying to upgrade from unsupported versions: 3.5

[Ariel Pérez Rodríguez]

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
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