CatDV 10.1.3 should still run in Mavericks (OS X 10.9) but won't work in Yosemite (OS X 10.10) because Apple removed some of the libraries that old versions of CatDV use. Worker Node 5 has the same requirements by the way, and will also not work in Yosemite.
Instead, for use on Yosmite you need CatDV 11 (and Worker 6) which use a completely different new architecture and run as 64-bit processes, with a separate native helper process to provide media processing capabilities.
Thanks for the explanation of why the older version won't work on Yosemite. I hadn't heard it before. Generally it's the other way around, where software won't run on older versions of the OS. This time it's more like the demise of the PowerPC.