Download of USBCaptureUtility 3.0.6 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. USBCaptureUtility for Mac relates to System Tools. The actual developer of this free Mac application is Nanjing Magewell Electronics Co., Ltd.
From the developer:
USB Capture Utility V3 is a free software app for USB Capture and USB Capture Plus devices. The users can easily check and set the capture-related parameters, upgrade the firmware by themselves, and export info needed for technical support with the help of the Utility.
You may want to check out more software for Mac, such as ImTOO iPhone Transfer, goSerial or Fire, which might be related to USBCaptureUtility.