CatDV Pro is available for both Macintosh (Mac OS 8/9 and OS X) and Windows. It requires Java and QuickTime, which you can download for free if they're not already provided on your system:
(Note that you need to do a custom installation and select all components, including "QuickTime for Java".)
The latest version of CatDV is always available at http://www.catdv.com. You should check this site regularly for updates and bug fixes. Updates are sometimes provided as a base version plus a "patch" consisting of just those files that are new and need to be replaced.
CatDV Pro works as a 30-day limited-functionality demo until you purchase a license on-line to use the full application. You will then be sent a registration code to unlock the application. Enter the name and registration code in the Registration tab of Preferences.
For sales and registration enquiries please contact sales@squarebox.co.uk; for technical support please contact support@squarebox.co.uk. You can also use the web shortcuts in the CatDV Help menu.
There are separate registration codes for the Personal Edition and Professional Edition of the client application, with different features available in each.