Running Voyager on Window 8 or 8.1 requires .Net 3.5. Most system ship with .Net 3.5 enable by default. If you try to run Voyager and you get a message about .Net is required, you will need to enable version 3.5 on the system.
See "Enable the .NET Framework 3.5 yourself through Control Panel" section. This option requires an Internet connection.