I'm receiving the following error window while trying to run Unity 4.0 setup "setup cannot upgrade from a version older than 3.0". I'm not upgrading, this is a new installation, it seems to be that the previous steps were setup succesfully.
Was there a Unity install on this box earlier? You'll see that error if you didn't properly uninstall Unity from the box - there may be residual files in a \commserver directory or the Active Voice registry branch may be around in part or in total in the HKLM\Software branch. Somehow or another the setup found some files/keys that indicated that there is already a version on the box.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.