Because Apple Inc doesn't support 32bit drivers and application software in the latest Catalina OS X, our old USB Video Capture solutions cannot support Catalina anymore. They include ezcap1568, 1168, 128 models. 

So, please don't update your system to Catalina version if you still want to use the device on Mac OS X. 

Right now, we have two models of USB Video Capture can support Catalina: ezcap158 UVC Video Capture, and ezcap159 USB Video Capture WinMac. And both of them work with QuickTime to capture video on Mac OS X. 

Sorry for bring you troubles, and hope you understanding.