Mac - From the Virtual TimeClock menu, choose About Virtual Timeclock.
Win - From the Help menu, choose About Virtual TimeClock.
You'll either be running the Basic Edition, the Pro Edition, or the Client Edition. If you're running version 5.x.x or older, then you'll need a different set of instructions for upgrading. If you're on the Client Edition, then you'll need to upgrade your TimeClock Server, as well as all of your TimeClock Clients.